Who said “An idea that is not dangerous is not worthy of being called an idea at all.”?

“Ideas too are a life and a world.”

“It is ideas, not vested interests, which are dangerous for good or evil.”

“All achievement, all earned riches, have their beginning in an idea! p.18”

“If you are possessed by an idea, you find it expressed everywhere, you even smell it.”

“Ideas are refined and multiplied in the commerce of minds. In their splendor, images effect a very simple communion of souls.”

“It is the weak man who urges compromise -- never the strong man.”

“Do not take life too seriously; you will never get out of it alive.”

“Your friend is the man who knows all about you, and still likes you.”

“The best preparation for good work tomorrow is to do good work today”

“A pessimist is a man who has been compelled to live with an optimist.”

“An event described by those to whom it was told by men who did not see it.”