Meditation 8.57

57. The sun appears to be poured down and indeed is poured in every direction but not poured out. For this pouring is extension, and so its beams are called rays from their being extended. Now you may see what kind of thing a ray is by observing the sun's light streaming through a chink into a darkened room. For it is stretched in a straight line, and rests so to speak upon any solid body that meets it and cuts off the flow of air beyond.[4] It rests there and does not glide off or fall. The pouring and diffusion of the understanding then should be similar, in no way a pouring out, but an extension, and it should not rest forcibly or violently on obstacles that meet it nor yet fall down, but stand still and illuminate the object that receives it; for that which does not reflect it will rob itself of the light.