To me, this passage is one of the most positive and hopeful verses you can find in the bible. When you ask, you will receive; when you seek, you will find; and, when you knock, the door will be opened.
Jesus put up a very good argument, he said, if those we consider bad people can even be generous to the one close to them, how much more his Father in heaven be generous to those who ask Him? It calls us to be persistent in our prayer because God will never deprive us of good things.
On the other hand, Jesus is trying to tell us that if those we consider wicked can give good things to their children how much more are we who follow Him? We who call ourselves as Christians should be the first to answer to the cry of those who are asking, seeking and knocking.
We must be the answered prayer to their deepest longings, the fulfillment to what they are seeking, and the open door to their hopeless conditions.
How can I be an answered prayer, a fulfillment and an open door to others?