A diamond is just a lump of coal that stuck to its job.

A bird is an instrument working according to mathematical law, which instrument it is within the capacity of man to reproduce with all its movements.

Given the cause nature produces the effect in the briefest manner that it can employ.

Just as a well-filled day brings blessed sleep, so a well-employed life brings a blessed death.

A good painter has two main objects to paint, man and the intention of his soul.

Man's external form, marvellously constructed, is not much as compared with the divine soul that dwells inside that structure.

Nothing strengthens authority so much as silence.