Shall we seek for the root of our comforts within us; what God hath done, what he is to us in Christ, is the root of our comfort. In this is stability; in us is weakness. Acts of obedience are not perfect, and therefore yield not perfect peace. Faith, as an act, yields it not, but as it carries us into him, who is our perfect rest and peace; in whom we are accounted of, and received by, the Father, even as Christ himself. This is our high calling. Rest we here, and here only.

Letter to Charles Fleetwood (1652).