'So I say to you: Ask, and it will be given to you; search, and you will find; knock, and the door will be opened to you. For the one who asks always receives; the one who searches always finds; the one who knocks will always have the door opened to him. What father among you would hand his son a stone when he asked for bread? Or hand him a snake instead of a fish? Or hand him a scorpion if he asked for an egg? If you then, who are evil, know how to give your children what is good, how much more will the heavenly Father give the Holy Spirit to those who ask him!' Luke 11: 1-13
Holman Hunt's famous painting shows Christ standing at a door holding a lantern but if you look at the door you will see there is no handle on the outside.
When Christ knocks He needs us to open the door to allow Him to come in. Sometimes we are not ready for Him. We delay and rush about saying well I'll just do this and that, or perhaps I won't even open the door at all. That's the moment when its worth pondering this passage of Scripture. Jesus is telling us that we, when we ask Him for anything ,will answer.