Luke 11:9,10 - Joseph Benson’s Commentary on the Old and New Testaments

I say unto you, Ask, &c. Pray frequently, and be most earnest and importunate in your prayers, because thus you shall obtain whatsoever you ask agreeably to the will of God. For if importunity would prevail thus with a man that was displeased at it, much more will it prevail with God, who is infinitely more kind and ready to do good to us than we are one to another; and is not displeased at our importunity, but accepts it, especially when the object of it is spiritual mercies. If he do not answer our prayers, and grant our requests presently, yet he will answer them in due time, if we continue to pray and exercise faith in his power, love, and faithfulness. Ask, therefore, what God in his word authorizes you to ask, and what you are persuaded it would be for God's glory that you should receive, and it shall be given you Either the thing itself which you ask, or that which is equivalent; either the removal of the thorn in the flesh, or grace sufficient to enable you to bear it. Of this we have an assurance from Christ's own mouth, who knows his Father's mind, and in whom all the promises of God are yea and amen. But we must not only ask, we must also seek, in the use of means; must second our prayers with our endeavours; and in asking and seeking, we must continue urgent, still knocking at the same door, and we shall at length prevail. For every one that asketh receiveth Even the meanest saint shall have his petition granted, that asks earnestly, importunately, and in faith. This poor man cried, and the Lord heard him, Psalms 34:6. When we ask of God those things which Christ, in the above prayer, has directed us to ask, namely, that his name may be sanctified; that his kingdom may come, and his will be done; in these requests we must be importunate, and must never hold our peace day or night. See on Matthew 7:7-8; where the same passage occurs.