No matter how closely we look, it is difficult to find a mental act that can take place without the support of some physical function.

In order to recognize small changes in effort, the effort itself must first be reduced. More delicate and improved control of movement is possible only through the increase of sensitivity, through a greater ability to sense differences.

If I hold a twenty pound weight, I cannot detect a fly landing on it because the least detectable difference in the stimulus is half a pound. On the other hand, if i hold a feather, a fly landing on it makes a great difference. Obviously then, in order to be able to tell the differences in exertion one must first reduce the exertion. Finer and finer performance is possible only if the sensitivity, that is, the ability to feel the difference is improved.

Learning to inhibit unwanted contractions of muscles that function without, or in spite of, our will, is the main task in coordinated action.

Ultimately, we become aware of most of what is going on within us mainly through the muscles.

In order to change our mode of action, we must change the image of ourselves that we carry within us.

Standing is harder than moving.