He who wishes to be rich in a day will be hanged in a year.

Nature alone is the master of true genius.

If you call painting dumb poetry, the painter may call poetry blind painting.

If you cause your ship to stop and place the head of a long tube in the water and place the outer extremity to your ear, you will hear ships at a great distance from you.

An arch consists of two weaknesses which, leaning one against the other, make a strength.

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.

Therefore, O students, study mathematics and do not build without foundations.