The human being, when he is born, hungers to do what he does, and he does not give up until he satisfies this hunger. The pressing forward to a karmic event is a result of such a generalized spiritual feeling of hunger. One is driven to the event.
Source: Rudolf Steiner – GA 205 – THERAPEUTIC INSIGHTS: EARTHLY AND COSMIC LAWS: Lecture IV – Dornach, 2 July 1921
Translation by May Laird-Brown