How is it possible that suffering that is neither my own nor of my concern should immediately affect me as though it were my own, and with such force that is moves me to action?
Arthur SchopenhauerWe will gradually become indifferent to what goes on in the minds of other people when we acquire a knowledge of the superficial nature of their thoughts, the narrowness of their views and of the number of their errors. Whoever attaches a lot of value to the opinions of others pays them too much honor.
Arthur SchopenhauerThe principle of contradiction establishes merely the agreement of concepts, but does not itself produce concepts.
Arthur Schopenhauer