Microscopes and telescopes really confuse our minds.

I have learned much from disease which life could have never taught me anywhere else.

There are people who pay attention to the weaknesses of their friends; that is to no avail. I have always closely watched and profited from the strengths of my adversaries.

There are people who make no mistakes because they never wish to do anything worth doing.

I am the Spirit that denies.

When you take a man as he is, you make him worse. When you take a man as he can be, you make him better.

The spectacle of Nature is always new, for she is always renewing the spectators. Life is her most exquisite invention; and death is her expert contrivance to get plenty of life.