where does love come from?

From Kierkegaard's Works of Love (Hong trans.):

Where does love come from, where does it have its origin and its source, where is the place it has its abode from which it flows? Yes, this place is hidden or is secret. There is a place in a person's innermost being; from this place flows the life of love, for 'from the heart flows life.' But you cannot see this place; however deeply you penetrate, the origin eludes you in remoteness and hiddenness. Even when you have penetrated furthest in, the origin is always still a bit further in, like the source of the spring is further away just when you are closest to it. From this place flows love along many paths, but along none of these paths can you force your way into its hidden origin. Just as God dwells in a light from which flows every ray that illuminates the world, yet no one can force his way along these paths in order to see God, since the paths of light turn into darkness when one turns toward the light--so love dwells in hiding or is hidden in the innermost being. Just as the gush of the spring lures by the murmuring persuasion of its rippling, indeed, almost pleads with a person to walk along that path and not inquisitively want to force his way in to find its source and disclose its secret; just as the sun's rays invite a person to behold the glory of the world by their help but warningly punish the presumptuous one with blindness when he wants to turn around in order, inquisitively and brazenly, to discover the origin of the light . . . Love's hidden life is in the innermost being, unfathomable, and then in turn is in an unfathomable connectedness with all existence. (8-9)