“Example has more followers than reason. We unconsciously imitate what pleases us, and insensibly approximate to the characters we most admire. In this way, a generous habit of thought and of action carries with it an incalculable influence.”

The Erasmus Reader (1990), p. 144.
Handbook of the Christian Soldier (1503)

Letter 56 (60), to Hugo Boxel (1674) http://oll.libertyfund.org/?option=com_staticxt&staticfile=show.php%3Ftitle=1711&chapter=144218&layout=html&Itemid=27
Source: The Letters
Context: When you say that if I deny, that the operations of seeing, hearing, attending, wishing, &c., can be ascribed to God, or that they exist in him in any eminent fashion, you do not know what sort of God mine is; I suspect that you believe there is no greater perfection than such as can be explained by the aforesaid attributes. I am not astonished; for I believe that, if a triangle could speak, it would say, in like manner, that God is eminently triangular, while a circle would say that the divine nature is eminently circular. Thus each would ascribe to God its own attributes, would assume itself to be like God, and look on everything else as ill-shaped.
The briefness of a letter and want of time do not allow me to enter into my opinion on the divine nature, or the questions you have propounded. Besides, suggesting difficulties is not the same as producing reasons. That we do many things in the world from conjecture is true, but that our redactions are based on conjecture is false. In practical life we are compelled to follow what is most probable; in speculative thought we are compelled to follow truth. A man would perish of hunger and thirst, if he refused to eat or drink, till he had obtained positive proof that food and drink would be good for him. But in philosophic reflection this is not so. On the contrary, we must take care not to admit as true anything, which is only probable. For when one falsity has been let in, infinite others follow.
Again, we cannot infer that because sciences of things divine and human are full of controversies and quarrels, therefore their whole subject-matter is uncertain; for there have been many persons so enamoured of contradiction, as to turn into ridicule geometrical axioms.

"Give!" (26 March 1944)
Variant translation: People will always follow a good example; be the one to set a good example, then it won't be long before the others follow.
Tales from the Secret Annex

The World's Last Night (1952)

Evangelical Meditations (1858)

Variant: People are generally better persuaded by the reasons which they have themselves discovered than by those which have come into the mind of others.
Source: Pensees

"Partaking in Other Men's Sins", an address at St. Margaret's Church, Lothbury, England (12 June 1855), printed in Golden Lectures (1855); eventually part of this statement become paraphrased in several slight variations, and has usually been misattributed to Herman Melville, i.e.: "We cannot live only for ourselves. A thousand fibers connect us with our fellow men; and along these fibers, as sympathetic threads, our actions run as causes, and they come back to us as effects".
Context: There is not one of you whose actions do not operate on the actions of others — operate, we mean, in the way of example. He would be insignificant who could only destroy his own soul; but you are all, alas! of importance enough to help also to destroy the souls of others.... Ye cannot live for yourselves; a thousand fibres connect you with your fellow-men, and along those fibres, as along sympathetic threads, run your actions as causes, and return to you as effects.

Part I, Essay 18: The Sceptic
Essays, Moral, Political, and Literary (1741-2; 1748)

The Contemporary Review
Context: If we cannot by reason, by influence, by example, by strenuous effort, and by personal sacrifice, mend the bad places of civilization, we certainly cannot do it by force. Force is the very weakest and most treacherous of all human implements. The history of force is the history of the continuous crumbling away of every institution that has rested upon it. — The Contemporary Review, The Ethics of Dynamite (1894)