1 We have heard our Lord, the Heavenly Master, and most faithful Counsellor exhorting us, who at once exhorts us to ask, and gives when we ask. We have heard Him in the Gospel exhorting us to ask instantly, and to knock even after the likeness of intrusive importunity. For He has set before us, for the sake of example, “If any of you had a friend, and were to ask of him at night for three loaves, when a friend out of his way had come to him, and he had nothing to set before him; and he were to answer that he was now at rest, and his servants with him, and that he must not be disturbed by his entreaties; but the other were to be instant and persevering in knocking, and not being alarmed in modesty to depart, but compelled by necessity to continue on; that he would rise, though not for friendship's sake, at least for the other's importunity, and would give him as many as he wished.”
And how many did he wish? He wished for no more than three. To this parable then, the Lord adjoined an exhortation, and urged us earnestly to ask, seek, knock, till we receive what we ask, and seek, and knock for, making use of an example from a contrary case; as of that “judge who neither feared God, nor regarded man,” and yet when a certain widow besought him day by day, overcome by her importunity, he gave her that which he could not in kindness give her, against his will.
But our Lord Jesus Christ, who is in the midst of us a Petitioner, with God a Giver, would not surely exhort us so strongly to ask, if He were not willing to give. Let then the slothfulness of men be put to shame; He is more willing to give, than we to receive; He is more willing to show mercy, than we to be delivered from misery; and doubtless if we shall not be delivered, we shall abide in misery. For the exhortation He gives us, He gives only for our own sakes.
Source: Sermons on Selected Lessons of the New Testament (New Advent)