"Great men are they who see that spiritual thought is stronger than any material force, that thoughts rule the world."

Ralph Waldo Emerson
Progress of Culture

"Thoughts are free and subject to no rule. On them rests the freedom of man, and they tower above the light of nature...create a new heaven, a new firmament, a new source of energy from which new arts flow."

Paracelsus

"Men fear thought as they fear nothing else on earth - more than ruin - more even than death... Thought is subversive and revolutionary, destructive and terrible, thought is merciless to privilege, established institutions, and comfortable habit. Thought looks into the pit of hell and is not afraid. Thought is great and swift and free, the light of the world, and the chief glory of man."

Betrand Russell