It inexorably compels the organism to adapt itself to its conditions, to like them, and so to survive them.
As soon as young eagles can fly the old birds tumble them out and tear the down and feathers from their nest.

The rude and rough experience of the eaglet fits him to become the bold king of birds, fierce and expert in pursuing his prey.
Benjamin Franklin ran away and George Law was turned out of doors.
Thrown upon their own resources, they early acquired the energy and skill to overcome difficulties.
Boys who are bound out, crowded out, kicked out, usually "turn out," while those who do not have these disadvantages frequently fail to "come out." From an aimless, idle and useless brain, emergencies often call out powers and virtues before unknown and unsuspected.

How often we see a young man develop astounding ability and energy after the death of a parent or the loss of a fortune, or after some other calamity has knocked the props and crutches from under him.

The prison has roused the slumbering fire in many a noble mind.

"Robinson Crusoe" was written in prison.