Holman Hunt was once showing some visitors round his studio; they stood before his well-known picture, ‘Light of the World.’
‘Surely you forgot something there,’ said one visitor. ‘Look, there’s no handle on the door.’
‘It was not a mistake,’ explained the artist. ‘This door represents the human heart, and it opens only from the inside.’
Our Lord stands outside and waits for us to say: ‘Come in.’ He will never force an entrance. It is for us to invite Him or not, as we choose.
Some Catholics keep Him standing at the door from one Easter duty to another.
– Rev. F.H. Drinkwater, Catechism Stories Part IV: The Sacraments (1939)