He who never puts his trust in any man will never be deceived.

The mole has very small eyes and it always lives under ground; and it lives as long as it is in the dark but when it comes into the light it dies immediately, because it becomes known;--and so it is with lies.

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.

Truth at last cannot be hidden. Dissimulation is of no avail. Dissimulation is to no purpose before so great a judge. Falsehood puts on a mask. Nothing is hidden under the sun.

The light and heat of the universe comes from the sun, and its cold and darkness from the withdrawal of the sun.

When you put your hand in a flowing stream, you touch the last that has gone before and the first of what is still to come.

Learning acquired in youth arrests the evil of old age.