"It is the natural and inherent impulse of life to seek to live more, it is the nature of intelligence to enlarge itself, and of consciousness to seek to extend its boundaries and find fuller expression."

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Just as a satisfaction of instinct spells happiness for us, so severe suffering is caused us if the external world lets us starve, if it refuses to sate our needs. One may therefore hope to be freed from a part of one's sufferings by influencing the instinctual impulses.

— Sigmund Freud