Instinct's (n.) entire existence serves the one end of bringing about death.
Instinct (n.) is a concept on the frontier between the somatic and the mental — the psychic representative of organic forces.
Instinct (n.) is multiplied at will in popular thought — an instinct of play, of imitation, of the herd — each taken up for a job and dropped again.
Instinct (n.) differs from a stimulus in coming from within the body as a constant force that cannot be escaped by flight.
Instinct (n.) is the source of all activity and yet conservative: it always strains to restore a state that has been left behind.
Instinct (n.) is scarcely ever met pure, only as a blend of the two groups of instincts in various proportions.
An Instinct (n.) that is over-powerful is likely active from earliest childhood and reinforced by sexual energy, so that a person may research with the devotion another gives to love.
Instinct (n.) is a kind of elasticity in living things, an urge to restore a state that an outside disturbance ended.
Instinct (n.) can never become conscious — only the idea that represents it can.
Instinct (n.) is a stimulus from within that no flight can escape: not a momentary impact but a constant force — better called a need.
Instinct (n.) is a frontier concept between mind and body: the psychical representative of inner stimuli, the measure of the demand for work the body makes on the mind.
An Instinct (n.) has its object as its most variable feature — not originally connected, assigned only because it happens to make satisfaction possible, and possibly a part of one's own body.
Instinct (n.) is wholly determined by its somatic source, yet in mental life we know it only by its aims.
Instinct (n.) develops like successive eruptions of lava: each wave added to the last, all its stages coexisting rather than replacing one another.
Instinct (n.) in animals is the memory of the species: it lets them act in a new life as if it were old, because they carry over what their ancestors experienced — and man's archaic heritage is his version of it.