A provocative excerpt from the book "Pilgrim at Tinker Creek" by Annie Dillard:
The secret of seeing is, then, the pearl of great price. If I thought he could teach me to find it and keep it forever I would stagger barefoot across a hundred deserts after any lunatic at all. But although the pearl may be found, it may not be sought. The literature of illumination reveals this above all: although it comes to those who wait for it, it is always, even to the most practiced and adept, a gift and a total surprise… I cannot cause light; the most I can do is try to put myself in the path of its beam.