“Small is the number of them that see with their own eyes and feel with their own hearts.”

“Few are those who see with their own eyes and feel with their own hearts.”

“Everyone must become their own person, however frightful that may be.”

“The important thing is not to stop questioning. Curiosity has its own reason for existing.”

“The man who regards his own life and that of his fellow-creatures as meaningless is not merely unfortunate but almost disqualified for life.”

“Man is here for the sake of other men - above all for those upon whose smiles and well-being our own happiness depends.”

“What I see in Nature is a magnificent structure that we can comprehend only very imperfectly, and that must fill a thinking person with a feeling of humility. This is a genuinely religious feeling that has nothing to do with mysticism.”