Most worldly affairs are performed by themselves.

Montaigne

Such as only meddle with things subject to the conduct of human capacity, are excusable in doing the best they can: but those other fellows that come to delude us with assurances of an extraordinary faculty, beyond our understanding, ought they not to be punished, when they do not make good the effect of their promise, and for the temerity of their imposture?

Michel de Montaigne