From Austin Farrer’s Said or Sung:
We cannot, merely by saying we will, put our whole trust in God. To trust in God is a thing which has to be learnt. We may stand up and make our profession of faith, clasp a missioner’s hand and say, “I have taken Christ for my Saviour, I trust him for all.” But we shall still trust ourselves to do our part in the new covenant we have entered. For we do not learn what dependence on God is, except through having our self-dependence broken in the mill of life, slowly and painfully. Many tears, much shame, continual repentance, this is the lot of those who pledge themselves to God. A paradoxical pledge; we learn to keep it by breaking it.