The man of knowledge must be able not only to love his enemies but also to hate his friends. Ecce Homo
Man’s being is made of such strange stuff as to be partly akin to nature and partly not, at once natural and extranatural, a kind of ontological centaur, half immersed in nature, half transcending it. History as a System
Physiologists and molecular biologists regularly fall into the trap of overlooking this distinction, which is fundamental to biology, history, and human behavior. Physiology and molecular biology can do no more than identify proximate mechanisms; only evolutionary biology can provide ultimate causal explanations. Why Is Sex Fun?: The Evolution of Human Sexuality
Gratitude is a rare frame of mind; and those who are grateful can seldom find a way to express what they feel. They are overwhelmed by silence; are shamefaced; and, sometimes, actually try to hide their feelings. Twenty-Four Hours in the Life of a Woman
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