"Die Botschaft hör ich wohl, allein mir fehlt der Glaube."

"Nothing is more terrible than ignorance in action."

"Knowing is not enough; we must apply. Willing is not enough; we must do."

"Thinking is easy, acting is difficult, and to put one's thoughts into action is the most difficult thing in the world."

"The human race is a monotonous affair. What one does, the other does, and what one suffers, the other suffers."