And what marvel, if it be so in respect of God, since not even in respect of an Angel, could one find a name expressive of his substance? Perhaps too, neither in respect of the soul. For this name [soul] doth not seem to me to be significative of the substance thereof, but of breathing. For one may see that the same [thing] is called both Soul and Heart and Mind: for, saith he, “Create in me a clean heart, O God” ( Ps. li. 10 ), and one may often see that it [the soul] is called spirit.