Advertisers constantly invent cures to which there is no disease.

He who truly knows has no occasion to shout.

Those who are enamoured of practice without science are like a pilot who goes into a ship without rudder or compass and never has any certainty of where he is going. Practice should always be based upon a sound knowledge of theory.

In rivers, the water that you touch is the last of what has passed and the first of that which comes; so with present time.

Just as iron rusts from disuse... even so does inaction spoil the intellect.

Simplicity is the ultimate sophistication.

Lying on a feather mattress or quilt will not bring you renown.