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.

Experiment is the sole interpreter of the artifices of Nature.

First study the science, and then practice the art which is born of that science.

Just as courage is the danger of life, so is fear its safeguard.

Poor is the pupil who does not surpass his master.

Experience is a truer guide than the words of others.

The motions of men must be such as suggest their dignity or their baseness.