I have been impressed with the urgency of doing. Knowing is not enough; we must apply. Being willing is not enough; we must do.

After painting comes Sculpture, a very noble art, but one that does not in the execution require the same supreme ingenuity as the art of painting, since in two most important and difficult particulars, in foreshortening and in light and shade, for which the painter has to invent a process, sculpture is helped by nature. Moreover, Sculpture does not imitate color which the painter takes pains to attune so that the shadows accompany the lights.

The lie is so vile, that even if it were in speaking well of godly things, it would take off something from God's grace; and Truth is so excellent, that if it praises but small things they become noble.

He who does not understand the supreme certainty of mathematics is wallowing in confusion.

Oh! Speculators on things, boast not of knowing the things that nature ordinarily brings about; but rejoice if you know the end of those things which you yourself device.

I am never weary of being useful... In serving others I cannot do enough. No labor is sufficient to tire me.

He who walks straight rarely falls.