O Time with your teethy years! You swallow up all things little by little in a slow-motion, wrinkling process of dying.

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.

In the days of thy youth seek to obtain that which shall compensate the losses of thy old age.

Every obstacle yields to stern resolve.

Whatever you do in life, if you want to be creative and intelligent, and develop your brain, you must do everything with the awareness that everything, in some way, connects to everything else.

To such an extent does nature delight and abound in variety that among her trees there is not one plant to be found which is exactly like another; and not only among the plants, but among the boughs, the leaves and the fruits, you will not find one which is exactly similar to another.

Poor is the pupil who does not surpass his master.