They who depend upon manifest observations will philosophize better than those who persist in opinions repugnant to the senses.

Wine is sunlight, held together by water.

See now the power of truth.

All truths are easy to understand once they are discovered; the point is to discover them.

In the sciences, the authority of thousands of opinions is not worth as much as one tiny spark of reason in an individual man.

To be humane, we must ever be ready to pronounce that wise, ingenious and modest statement 'I do not know'.

E pur si muove. "Albeit It does move". (That's what Galileo purportedly muttered after torturers forced him to recant his theory that the earth orbits the sun.)