2. The Lord points out here five things necessary to constitute true prayer.
The first is God’s promise, which is the chief thing and is the foundation and power of all prayers. For he promises here that it shall be given us if we ask; and besides he swears: “Verily, verily, I say unto you, If ye shall ask anything of the Father, he will give it you in my name.” He promises that we might be sure of being heard in prayer; yea, he censures the disciples for the reason that they are lazy and have not therefore been praying. As if he would say: God is ready to give more quickly, and to give more than you ask; yea, he offers his treasures if we only take them. It is truly a great shame and a severe chastisement for us Christians that God should still upbraid us for our slothfulness in prayer, and that we fail to let such a rich and excellent promise incite us to pray. We let this precious treasure lie there, and seek it not, nor exercise ourselves to receive the power in such a promise.
3. So God himself now founds our prayer upon his promise and thereby encourages us to pray. If it were not for this promise, who would have the courage to pray? We have hitherto resorted to many ways of preparing ourselves to pray — ways with which the books are filled; but if you wish to be well prepared, take the promise and lay hold of God with it. Then your courage and desire to pray will soon grow, which courage you will never otherwise get. For “those who pray without God’s promise, imagine in themselves how angry God is, whom they wish to propitiate by means of their prayers. Without faith in the promise, there is then, neither courage nor desire to pray, but mere uncertain delusion and a melancholy spirit; there is, therefore, no hearing of prayers, and both prayer and labor are lost.
