John Calvin Commentary Luke 11:5

"And he said unto them, Which of you shall have a friend, and shall go unto him at midnight, and say to him, Friend, lend me three loaves;" — Luke 11:5 (ASV)

Which of you shall have a friend (Luke 11:5), Luke adds this comparison, which is not mentioned by Matthew. The general instruction conveyed by it is this: Believers ought not to be discouraged if they do not immediately obtain their desires, or if they find them difficult to obtain. For if, among people, persistence in asking compels what a person would not willingly do, we have no reason to doubt that God will listen to us, if we persevere constantly in prayer, and if our minds do not falter through difficulty or delay.