A good memory, which nature has endowed us with, causes things long past to seem present.

Nothing can be loved or hated unless it is first known.

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.

There is no object so large but that at a great distance from the eye it does not appear smaller than a smaller object near.

Art is never finished, only abandoned.

I have from an early age abjured the use of meat, and the time will come when men such as I will look upon the murder of animals as they now look upon the murder of men.

If you find from your own experience that something is a fact and it contradicts what some authority has written down, then you must abandon the authority and base your reasoning on your own findings.