No picture of life can have any veracity that does not admit the odious facts. A man's power is hooped in by a necessity, which, by many experiments, he touches on every side, until he learns its arc.
Common sense invents and constructs no less than its own field than science does in its domain. It is, however, in the nature of common sense not to be aware of this situation.
There are many definite methods, honest and dishonest, which make people rich; the only instinct I know of which does it is that instinct which theological Christianity crudely describes as the sin of avarice.