Do you know what frees one from this captivity?

One cannot always tell what it is that keeps us shut in, confines us, seems to bury us, but still one feels certain barriers, certain gates, certain walls. Is all this imagination, fantasy? I do not think so. And then one asks: My God! Is it for long, is it for ever, is it for eternity? Do you know what frees one from this captivity? It is very deep serious affection. Being friends, being brothers, love, that is what opens the prison by supreme power, by some magic force.

– Vincent van Gogh, letter to his brother, July 1880.