Every obstacle yields to stern resolve.

It's not enough that you believe what you see. You must also understand what you see.

A day will come in which men will look upon an animal's murder the same way they look today upon a man's murder.

It vexes me greatly that having to earn my living has forced me to interrupt the work and to attend to small matters.

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?

The Bactrian have two humps; the Arabian one only. They are swift in battle and most useful to carry burdens. This animal is extremely observant of rule and measure, for it will not move if it has a greater weight than it is used to, and if it is taken too far it does the same, and suddenly stops and so the merchants are obliged to lodge there.

Whoever does not respect life, does not deserve it.