Luke 11:9

Jesus introduced this promise with a phrase that underlined its reliability and gave His personal guarantee. Everyone who asks of God will receive from Him, not just the persistent (cf. Matthew 7:7-8). In the context everyone is every one of His children (Luke 11:13). Jesus urged His disciples to pray. He probably meant that we must ask to receive (cf. James 4:2). Those who seek God’s attention and response in prayer will find it (cf. Jeremiah 29:12-13). Those who knock on the closed door of God’s heavenly house will find that He will open to them and give them what is best (cf. Luke 11:7).

"In other words, don’t come to God only in the midnight emergencies, but keep in constant communion with your Father." [Note: Wiersbe, 1:215. Author’s italics removed.]