Basil of Caesarea — as excerpted in the Catena Aurea on Luke 11:9-13

“(in Const. c. 1.) If also any one from indolence surrenders himself to his desires, and betrays himself into the hands of his enemies, God neither assists him nor hears him, because by sin he has alienated himself from God. It becomes then a man to offer whatever belongs to him, but to cry to God to assist him. Now we must ask for the Divine assistance not slackly, nor with a mind wavering to and fro, because such a one will not only not obtain what it seeks, but will the rather provoke God to anger. For if a man standing before a prince has his eye fixed within and without, lest perchance he should be punished, how much more before God ought he to stand watchful and trembling? But if when awakened by sin you are unable to pray stedfastly to the utmost of your power, check yourself, that when you stand before God you may direct your mind to Him. And God pardons you, because not from indifference, but infirmity, you cannot appear in His presence as you ought. If then you thus command yourself, do not depart until you receive. For whenever you ask and receive not, it is because your request was improperly made, either without faith, or lightly, or for things which are not good for you, or because you left off praying. But some frequently make the objection, “Why pray we? Is God then ignorant of what we have need?” He knows undoubtedly, and gives us richly all temporal things even before we ask. But we must first desire good works, and the kingdom of heaven; and then having desired, ask in faith and patience, bringing into our prayers whatever is good for us, convicted of no offence by our own conscience.”