P. 61. _Speak not about Pythagoric concerns without light._

This is the 13th Symbol in the Protreptics, and is thus explained by

Iamblichus: “This Symbol exhorts to the possession of intellectual

prudence. For this is similar to the light of the soul, to which being

indefinite it gives bound, and leads, as it were, from darkness into

light. It is proper, therefore, to place intellect as the leader of

every thing beautiful in life, but especially in Pythagoric dogmas; for

these cannot be known without light.”