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"Memory is a complicated thing, a relative to truth, but not its twin."

The only valid data for psychology are the reports of trained observers.

The desire for recognition, the thymotic part of the soul, is the most fundamentally human part of the human personality.

"The only true wisdom is in knowing you know nothing."

The end of history will be a very sad time. The struggle for recognition, the willingness to risk one's life for a purely abstract goal, the worldwide ideological struggle that called forth daring, courage, imagination, and idealism, will be replaced by economic calculation, the endless solving of technical problems, environmental concerns, and the satisfaction of sophisticated consumer demands.