"I sense that, without sensitivity to physical pain and pleasure, man would not have known self-interest, and consequently know just or unjust acts. Thus, physical sensitivity and self-interest are the authors of all justice."

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Life is both pleasure and pain, is it not? But why should we cling to pleasure and avoid pain? Why not merely live with both? If you cling to pleasure what happens? You get attached, do you not?

— Jiddu Krishnamurti