Jesus told us to ask in order to receive, to seek in order to find, and to knock in order for the door to be opened.
ask -> receive
seek -> find
knock -> open
This seems straightforward: ask, seek, and knock. But what is the door that will be opened? Is it a door to heaven? Or perhaps a door to eternal life? Can it be more general, suggesting the realization of whatever we prayed for? Whatever the open door means, one thing is clear: God responds.
Later on Jesus turns this thought around, saying he is standing at our door and knocking. If we hear him and let him, he will come in and be with us.
But he won’t force his way in if he’s not invited, but he is there and waiting, ready when we are.