Faith and prayer are simple things, . . . but when we begin to want faith, and to assist prayer by our own inventions and to explain away God's providence, then faith and prayer become intricate and uncertain. We cannot serve God and mammon. We must either utterly depend on God (and therefore on our own reason enlightened by His spirit after prayer), or we must utterly depend on the empirical maxims of the world. Choose!

MS. Letter.