The main difficulty, therefore, is not in our work, but in ourselves; in the conflict with our own unbelief, in the form either of indolence or of self-dependence. When faith is really brought into action, the extent and aggravation of the difficulty (even were it increase an hundred-fold) is a matter of little comparative moment. Difficulties heaped upon difficulties can never rise to the level of the promises of God. To meet the trembling apprehensions—“Who is sufficient for these things?” the answer is ready—“Our sufficiency is of God.” There is a link in the chain of moral causes and effects, which connects the helplessness of the creature with the Omnipotence of God, and encourages the creature to attempt every thing in the conscious inability to do any thing: and thus “in weakness” thoroughly felt, Divine “strength is made perfect. “ It is equally important to feel our abasement, and to maintain it with a corresponding high; let us realize our weakness and strength at the same moment; let their be a remembrance, as well as a present exercise of faith.
–Charles Bridges, The Christian Ministry, page 175-176