Necessity is the theme and the inventress, the eternal curb and law of nature.
1136.
In many cases one and the same thing is attracted by two strong forces, namely Necessity and Potency. Water falls in rain; the earth absorbs it from the necessity for moisture; and the sun evaporates it, not from necessity, but by its power.
1137.
Weight, force and casual impulse, together with resistance, are the four external powers in which all the visible actions of mortals have their being and their end.
1138.
Our body is dependant on heaven and heaven on the Spirit.
1139.
The motive power is the cause of all life.
Psychology (1140-1147).