“A critical attitude, like activity, is one of the fundamental characteristics of our time. Both are interdependent. If the critical attitude should dwindle, there would be more peace and less intelligence, to the benefit of the essential. Neither criticism nor activity, however, can steer the course in such a direction - this means that higher forces are involved.”

“Humor today goes hand in hand with our rationality, and not just rationality in the sense of cognitive sophistication, but also in the sense of a rational attitude toward the world. Part of this attitude is viewing things critically, and people with a well developed sense of humor naturally look at things critically, because they are looking for incongruity. ”

“No one ever accepts criticism so cheerfully. Neither the man who utters it nor the man who invites it really means it.”

“There is no harm in our criticizing foreigners, if only we would also criticize ourselves. In other words, the world might need even less of its new charity, if it had a little more of the old humility.”

“When my time on earth is gone, and my activities here are passed, I want they bury me upside down, and my critics can kiss my ass!”

“The cause neither of truth nor of love is promoted by suppressing warranted criticism.”