The vigorous man industriously striving for the improvement of his condition acts neither more nor less than the lethargic man who sluggishly takes things as they come. For to do nothing and to be idle are also action, they too determine the course of events.
It is not enough for [the investor] to know all the factors that can possibly contribute to the determination of a future event. In order to anticipate correctly they must also anticipate correctly the quantity as it were of each factor's contribution and the instant at which its contribution will become effective.
The methods of the natural sciences cannot be applied to human behavior because this behaviorlacks the peculiarity that characterizes events in the field of the natural sciences, viz., regularity.
There is in the universe something for the description and analysis of which the natural sciences cannot contribute anything. There are events beyond the range of those events that the procedures of the natural sciences are fit to observe and describe. There is human action.
He who only wishes and hopes does not interfere actively with the course of events and with the shaping of his own destiny.