You learn to speak by speaking, to study by studying, to run by running, to work by working; in just the same way, you learn to love by loving.

The power of love itself weakens and gradually becomes lost with age, like all the other energies of man.

The man of science multiples the points of contact between man and nature.

The mania of thinking renders one unfit for every activity.

The average man does not know what to do with this life, yet wants another one which will last forever.

The heart errs like the head; its errors are not any the less fatal, and we have more trouble getting free of them because of their sweetness.

True education is the ability to discern the difference between what you do know and what you don't.