While I thought that I was learning how to live, I have been learning how to die.

I have been impressed with the urgency of doing.

What is fair in men, passes away, but not so in art

No human investigation can claim to be scientific if it doesn't pass the test of mathematical proof.

We know more about the movement of celestial bodies than about the soil underfoot.

O sleepers! what a thing is slumber! Sleep resembles death. Ah, why then dost thou not work in such wise as that after death thou mayst retain a resemblance to perfect life, when, during life, thou art in sleep so like to the hapless dead?

Every action needs to be prompted by a motive.