Plato: Doing

“Then the case is the same in all the other arts for the orator and his rhetoric; there is no need to know the truth of the actual matters, but one merely needs to have discovered some device of persuasion which will make one appear to those who do not know to know better than those who know.”

Plato

Gorgias

Truth , Art , Appearance

“And when the father who begat it perceived the created image of the eternal gods, that it had motion and life, he rejoiced and was well pleased; and he bethought him to make it yet more nearly like its pattern. Now whereas that is a living being eternally existent, even so he essayed to make this All the like to the best of his power. Now so it was that the nature of the ideal was eternal. But to bestow this attribute altogether upon a created thing was impossible; so he bethought him to make a moving image of eternity, and while he was ordering the universe he made of eternity that abides in unity an eternal image moving according to number, even that which we have named time. For whereas days and nights and months and years were not before the universe was created, he then devised the generation of them along with the fashioning of the universe. Now all these are portions of time, and was and shall be are forms of time that have come to be, although we wrongly ascribe them unawares to the eternal essence. For we say that it was and is and shall be, but in verity is alone belongs to it: and was and shall be it is meet should be applied only to Becoming which moves in time; for these are motions. But that which is ever changeless without motion must not become elder or younger in time, neither must it have become so in past nor be so in the future; nor has it to do with any attributes that Becoming attaches to the moving objects of sense: these have come into being as forms of time, which is the image of eternity and revolves according to number. Moreover we say that the become is the become, and the becoming is the becoming, and that which shall become is that which shall become, and not-being is not-being. In all this we speak incorrectly. But concerning these things the present were perchance not the right season to inquire particularly.”

Plato book Timaeus

38b, as quoted by R. D. Archer-Hind, The Timaeus of Plato (1888)
Timaeus

Life , God , Fashion , Nature

“Time then has come into being along with the universe, that being generated together, together they may be dissolved, should a dissolution of them ever come to pass; and it was made after the pattern of the eternal nature, that it might be as like to it as was possible. For the pattern is existent for all eternity; but the copy has been and is and shall be throughout all time continually. So then this was the plan and intent of God for the generation of time; the sun and the moon and five other stars which have the name of planets have been created for defining and preserving the numbers of time. …and a month is fulfilled when the moon, after completing her own orbit, overtakes the sun; a year, when the sun has completed his own course. But the courses of the others men have not taken into account, save a few out of many… they do not know that time arises from the wanderings of these, which are incalculable in multitude and marvellously intricate. None the less however can we observe that the perfect number of time fulfils the perfect year at the moment when the relative swiftnesses of all the eight revolutions accomplish their course together and reach their starting-point, being measured by the circle of the same and uniformly moving. In this way then and for these causes were created all such of the stars as wander through the heavens and turn about therein, in order that this universe may be most like to the perfect and ideal animal by its assimilation to the eternal being.”

Plato book Timaeus

38d–40a, as quoted by R. D. Archer-Hind, The Timaeus of Plato https://books.google.com/books?id=q2YMAAAAIAAJ (1888)
Timaeus

Men , God , Way , Star

“[Aristotle] was the most eminent of all the pupils of Plato…. He seceded from Plato while he was still alive; so that they tell a story that [Plato] said, "Aristotle has kicked us off, just as chickens do their mother after they have been hatched."”

Plato

’’The Lives and Opinions of Eminent Philosophers’’, Book V, "Life of Aristotle" http://classicpersuasion.org/pw/diogenes/dlaristotle.htm paragraphs II and IV, as translated by C. D. Yonge
In Diogenes Laërtius

“As you hope to prove your own great value to the state, and having proved it, to attain at once to absolute power, so do I indulge a hope that I shall be the supreme power over you, if I am able to prove my own great value to you.”

Plato

Socrates speaking to Alcibiades
Alcibiades I

Hope

“Meno: I feel, somehow, that I like what you are saying.
Socrates: And I, Meno, like what I am saying. Some things I have said of which I am not altogether confident. But that we shall be better and braver and less helpless if we think that we ought to enquire, than we should have been if we indulged in the idle fancy that there was no knowing and no use in seeking to know what we do not know; — that is a theme upon which I am ready to fight, in word and deed, to the utmost of my power.”

Plato book Meno

Meno

Feeling , Confidence , Thinking , Fight

“Successful people never worry about what others are doing.”

Plato

Alleged source in Plato unknown. Earliest occurrence to have been located is a Tweet from 2011 https://twitter.com/ochocinco/status/93332058864238592.
Disputed

People , Success

“Since those who rule in the city do so because they own a lot, I suppose they're unwilling to enact laws to prevent young people who've had no discipline from spending and wasting their wealth, so that by making loans to them, secured by the young people's property, and then calling those loans in, they themselves become even richer and more honored.”

Plato The Republic

555c, G. Grube and C. Reeve, trans., Plato: Complete Works (1997), p. 1166
The Republic

People , Law , Wealth

“The orators — and the despots — have the least power in their cities … since they do nothing that they wish to do, practically speaking, though they do whatever they think to be best.”

Plato

Gorgias

Thinking

“I do see one large and grievous kind of ignorance, separate from the rest, and as weighty as all the other parts put together. Thinking that one knows a thing when one does not know it. Through this, I believe, all the mistakes of the mind are caused in all of us.”

Plato book Sophist

229c
Sophist