Nature has had regard in everything no less to the end than to the beginning and the continuance, just like the man who throws up a ball. What good is it then for the ball to be thrown up, or harm for it to come down, or even to have fallen? And what good is it to the bubble while it holds together, or what harm when it is burst? The same may be said of a light also.
The sun appears to be poured down, and in all directions indeed it is diffused, yet it is not effused. For this diffusion is extension: Accordingly its rays are called Extensions [aktines] because they are extended [apo tou ekteinesthai]. But one may judge what kind of a thing a ray is, if he looks at the sun's light passing through a narrow opening into a darkened room, for it is extended in a right line, and as it were is divided when it meets with any solid body which stands in the way and intercepts the air beyond; but there the light remains fixed and does not glide or fall off. Such then ought to be the out-pouring and diffusion of the understanding, and it should in no way be an effusion, but an extension, and it should make no violent or impetuous collision with the obstacles which are in its way; nor yet fall down, but be fixed and enlighten that which receives it. For a body will deprive itself of the illumination, if it does not admit it.
Among the animals which have not reason one life is distributed; but among reasonable animals one intelligent soul is distributed: just as there is one earth of all things which are of an earthy nature, and we see by one light, and breathe one air, all of us that have the faculty of vision and all that have life.
Does the light of the lamp shine without losing its splendour until it is extinguished; and shall the truth which is in thee and justice and temperance be extinguished before thy death?