John Wesley: Doing

“Do all the good you can,
By all the means you can,
In all the ways you can,
In all the places you can,
At all the times you can,
To all the people you can,
As long as you ever can.”

John Wesley

Variant Do all the good you can, in all the ways you can, to all the souls you can, in every place you can, at all the times you can, with all the zeal you can, as long as ever you can.
In the sermon titled "The Use of Money" Wesley said, "Employ whatever God has entrusted you with in doing good, all possible good, in every possible kind and degree . . . to all men." This sermon is in the collection titled "Wesley's Standard Sermons." They are called "standard" because all Methodist preachers were instructed to read them and use them in interpreting the Christian faith.
Disputed
Variant: Do all the good you can. By all the means you can. In all the ways you can. In all the places you can. At all the times you can. To all the people you can. As long as ever you can.
Source: According to Richard Heitzenrater, Professor of Church History and Wesleyan Studies at Duke Divinity School, there is no evidence that John Wesley ever wrote the rule that is attributed to him.

People , Way , Time

“If he forbid you, do not you forbid him. Rather labour, and watch, and pray the more, to confirm your love toward him. If he speak all manner of evil of you, speak all manner of good (that is true) of him.”

John Wesley

Sermon 38 "A Caution against Bigotry http://www.ccel.org/ccel/wesley/sermons.v.xxxviii.html
Sermons on Several Occasions (1771)
Context: In order to examine ourselves thoroughly, let the case be proposed in the strongest manner. What, if I were to see a Papist, an Arian, a Socinian casting out devils? If I did, I could not forbid even him, without convicting myself of bigotry. Yea, if it could be supposed that I should see a Jew, a Deist, or a Turk, doing the same, were I to forbid him either directly or indirectly, I should be no better than a bigot still.
O stand clear of this! But be not content with not forbidding any that casts out devils. It is well to go thus far; but do not stop here. If you will avoid all bigotry, go on. In every instance of this kind, whatever the instrument be, acknowledge the finger of God. And not only acknowledge, but rejoice in his work, and praise his name with thanksgiving. Encourage whomsoever God is pleased to employ, to give himself wholly up thereto. Speak well of him wheresoever you are; defend his character and his mission. Enlarge, as far as you can, his sphere of action; show him all kindness in word and deed; and cease not to cry to God in his behalf, that he may save both himself and them that hear him.
I need add but one caution: Think not the bigotry of another is any excuse for your own. It is not impossible, that one who casts out devils himself, may yet forbid you so to do. You may observe, this is the very case mentioned in the text. The Apostles forbade another to do what they did themselves. But beware of retorting. It is not your part to return evil for evil. Another’s not observing the direction of our Lord, is no reason why you should neglect it. Nay, but let him have all the bigotry to himself. If he forbid you, do not you forbid him. Rather labour, and watch, and pray the more, to confirm your love toward him. If he speak all manner of evil of you, speak all manner of good (that is true) of him.

Love , Evil

“But as to all opinions which do not strike at the root of Christianity, we think and let think.”

John Wesley

"The Character of a Methodist" (1739); in The Works of the Rev. John Wesley in Ten Volumes (1826), Volume IV, p. 407; A portion of this is commonly quoted as "Think and let think.".
General sources
Context: The distinguishing marks of a Methodist are not his opinions of any sort. His assenting to this or that scheme of Religion, his embracing any particular set of notions, his espousing the judgment of one man or of another, are all quite wide of the point. Whosoever therefore imagines, that a Methodist is a man of such or such an opinion, is grossly ignorant of the whole affair; he mistakes the truth totally. We believe indeed, that all Scripture is given by the inspiration of God, and herein we are distinguished from Jews, Turks, and Infidels. We believe the written word of God to be the only and sufficient rule, both of Christian faith and practice; and herein we are fundamentally distinguished from those of the Romish church. We believe Christ to be the eternal, supreme God; and herein we are distinguished from the Socinians and Arians. But as to all opinions which do not strike at the root of Christianity, we think and let think. So that whatsoever they are, whether right or wrong, they are no distinguishing marks of a; Methodist.

Thinking

“In order to examine ourselves thoroughly, let the case be proposed in the strongest manner. What, if I were to see a Papist, an Arian, a Socinian casting out devils? If I did, I could not forbid even him, without convicting myself of bigotry. Yea, if it could be supposed that I should see a Jew, a Deist, or a Turk, doing the same, were I to forbid him either directly or indirectly, I should be no better than a bigot still.”

John Wesley

Sermon 38 "A Caution against Bigotry http://www.ccel.org/ccel/wesley/sermons.v.xxxviii.html
Sermons on Several Occasions (1771)
Context: In order to examine ourselves thoroughly, let the case be proposed in the strongest manner. What, if I were to see a Papist, an Arian, a Socinian casting out devils? If I did, I could not forbid even him, without convicting myself of bigotry. Yea, if it could be supposed that I should see a Jew, a Deist, or a Turk, doing the same, were I to forbid him either directly or indirectly, I should be no better than a bigot still.
O stand clear of this! But be not content with not forbidding any that casts out devils. It is well to go thus far; but do not stop here. If you will avoid all bigotry, go on. In every instance of this kind, whatever the instrument be, acknowledge the finger of God. And not only acknowledge, but rejoice in his work, and praise his name with thanksgiving. Encourage whomsoever God is pleased to employ, to give himself wholly up thereto. Speak well of him wheresoever you are; defend his character and his mission. Enlarge, as far as you can, his sphere of action; show him all kindness in word and deed; and cease not to cry to God in his behalf, that he may save both himself and them that hear him.
I need add but one caution: Think not the bigotry of another is any excuse for your own. It is not impossible, that one who casts out devils himself, may yet forbid you so to do. You may observe, this is the very case mentioned in the text. The Apostles forbade another to do what they did themselves. But beware of retorting. It is not your part to return evil for evil. Another’s not observing the direction of our Lord, is no reason why you should neglect it. Nay, but let him have all the bigotry to himself. If he forbid you, do not you forbid him. Rather labour, and watch, and pray the more, to confirm your love toward him. If he speak all manner of evil of you, speak all manner of good (that is true) of him.

“Unless God has raised you up for this very thing, you will be worn out by the opposition of men and devils. But if God be for you, who can be against you? Are all of them together stronger than God? O be not weary of well doing!”

John Wesley

Men , God

“It is true, likewise, that the English in general, and indeed most of the men of learning in Europe, have given up all accounts of witches and apparitions, as mere old wives' fables. I am sorry for it; and I willingly take this opportunity of entering my solemn protest against this violent compliment which so many that believe the Bible pay to those who do not believe it. I owe them no such service. I take knowledge these are at the bottom of the outcry which has been raised, and with such insolence spread throughout the nation, in direct opposition not only to the Bible, but to the suffrage of the wisest and best of men in all ages and nations. They well know (whether Christians know it or not), that the giving up witchcraft is, in effect, giving up the Bible; and they know, on the other hand, that if but one account of the intercourse of men with separate spirits be admitted, their whole castle in the air (Deism, Atheism, Materialism) falls to the ground. I know no reason, therefore, why we should suffer even this weapon to be wrested out of our hands. Indeed there are numerous arguments besides, which abundantly confute their vain imaginations. But we need not be hooted out of one; neither reason nor religion require this.”

John Wesley

Nehemiah Curnock, ed., 'The Journal of the Rev. John Wesley, A.M.', London, Charles H. Kelly, vol. 5, p. 265 https://archive.org/stream/a613690405wesluoft#page/265/mode/1up (entry of 25 May 1768)
General sources

Men , Age , Religion , Imagination

“The longer I live, the larger allowances I make for human infirmities. I exact more from myself, and less from others. Go thou and do likewise!”

John Wesley

Letter to Reverend Samuel Furley (25 Janurary 1762), Published in The Life and Times of the Rev. John Wesley, M. A., Founder of the Methodists (1872) by Luke Tyerman, p. 451.
1760s

Making love

“Are you a man? Then you should have an human heart. But have you indeed? What is your heart made of? Is there no such principle as Compassion there? Do you never feel another's pain? Have you no Sympathy? No sense of human woe? No pity for the miserable? When you saw the flowing eyes, the heaving breasts, or the bleeding sides and tortured limbs of your fellow-creatures, was you a stone, or a brute? Did you look upon them with the eyes of a tiger? When you squeezed the agonizing creatures down in the ship, or when you threw their poor mangled remains into the sea, had you no relenting? Did not one tear drop from your eye, one sigh escape from your breast? Do you feel no relenting now? If you do not, you must go on, till the measure of your iniquities is full. Then will the Great GOD deal with You, as you have dealt with them, and require all their blood at your hands.”

John Wesley

Source: 1770s, Thoughts Upon Slavery (1774)

Sea , Sense , Tear , God

“Beware you are not a fiery, persecuting enthusiast. Do not imagine that God has called you (just contrary to the spirit of Him you style your Master) to destroy men’s lives, and not to save them. Never dream of forcing men into the ways of God. Think yourself, and let think. Use no constraint in matters of religion. Even those who are farthest out of the way never compel to come in by any other means than reason, truth, and love.”

John Wesley book Sermons on Several Occasions

1770s, Sermons on Several Occasions (1771)
Source: Sermon 37 "The Nature of Enthusiasm"

Imagination , Thinking , Love , Men