It is a ruse of the devil, by which he deceives good people, to induce them to do more than they are able, so that they end up not being able to do anything. The spirit of God urges one gently to do the good that can be done reasonably, so that it may be done perseveringly and for a long time.

Correspondence, Conferences, Documents: I. Correspondence. v. 1. 1607-1639 (ed. 1985)