Let proportion be found not only in numbers and measures, but also in sounds, weights, times, and positions, and what ever force there is.

The eye - which sees all objects reversed - retains the images for some time.

Why does the eye see a thing more clearly in dreams than the imagination when awake?

A man of supreme folly: his life flies away while he is merely hoping to enjoy it.

In life beauty perishes, but not in art.

Just as courage imperils life, fear protects it.

O neglectful Nature, wherefore art thou thus partial, becoming to some of thy children a tender and benignant mother, to others a most cruel and ruthless stepmother? I see thy children given into slavery to others without ever receiving any benefit, and in lieu of any reward for the services they have done for them they are repaid by the severest punishments.