From 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. But acting man chooses, determines, and tries to reach an end.
Are you an acting man?
(Yes, yes, I know Mises’ point is that we are all “acting men.” By our very nature, and the fact of our consciousness, we act. But I mean it in a less literal way: Are you a wisher or a doer?)