The figure of Christ holding a lantern and knocking on a wooden door is clear enough. Momentary study reveals that the door has no handle: it can only be opened from within. The door is the door to our hearts, and knock as loudly as he might, only we can open the door and let Christ in.
20 Here I am! I stand at the door and knock. If anyone hears my voice and opens the door, I will come in and eat with that person, and they with me.
21 To the one who is victorious, I will give the right to sit with me on my throne, just as I was victorious and sat down with my Father on his throne. 22 Whoever has ears, let them hear what the Spirit says to the churches.Revelation 3:20-22
Lord Jesus, you stand at the threshold of every heart and seek the welcome of an open door. As our doorbells invite us to welcome friends and strangers alike, may we also invite and welcome you as a permanent guest into our lives. Amen
Source: Adapted from At Home In Lent – An exploration of Lent through 46 objects by Gordon Giles.