He does not simply do things because he has intelligence,--simply that is, because he sees how to do them without first learning how; that is the older and probably quite erroneous view of intelligence.

The mind can not move the body simply by its fiat.

No man can do that.

Man, like the little animal, has to try things and keep on trying things, in order to find out the way they work and what their possibilities are.

And each animal, man, beast, or bird has to do it for himself.