Quotaria

A critic in my house sees some paintings. Greatly
perturbed, he asks for my drawings. My drawings?
Never! They are my letters, my secrets.
- Paul Gauguin

It is not the insurrections of ignorance that are
dangerous, but the revolts of the intelligence.
- James Russell Lowell

Learning carries within itself certain dangers because
out of necessity one has to learn from one's enemies.
- Leon Trotsky

An idea that is not dangerous is unworthy
of being called an idea at all.
- Don Marquis

There is no loneliness greater than the loneliness of
a failure. The failure is a stranger in his own house.
- Eric Hoffer

Thank God men cannot as yet fly and lay
waste the sky as well as the earth!
- Henry David Thoreau