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- In friendship as well as love, ignorance very often contributes more to our happiness than knowledge. — Francois de La Rochefoucauld
- Only on paper has humanity yet achieved glory, beauty, truth, knowledge, virtue, and abiding love. — George Bernard Shaw
- The man of knowledge must be able not only to love his enemies but also to hate his friends. — Friedrich Nietzsche
- To express the same idea in still another way, I think that human knowledge is essentially active. — Jean Piaget
- Scientific knowledge is in perpetual evolution; it finds itself changed from one day to the next. — Jean Piaget
- In genetic epistemology, as in developmental psychology, too, there is never an absolute beginning. — Jean Piaget