Love.

van Gogh, Self-Portrait, 1887

I’m always inclined to believe that the best way of knowing [the divine] is to love a great deal. Love that friend, that person, that thing, whatever you like, you’ll be on the right path to knowing more thoroughly, afterwards; that’s what I say to myself. But you must love with a high, serious intimate sympathy, with a will, with intelligence, and you must always seek to know more thoroughly, better, and more.

Vincent van Gogh, from a letter to his brother, Theo, June 1880