viii.).

Further, by the attributes of God we must understand that which (by Def.
iv.) expresses the essence of the divine substance--in other words, that which appertains to substance: that, I say, should be involved in the attributes of substance.

Now eternity appertains to the nature of substance (as I have already shown in Prop.

vii.); therefore, eternity must appertain to each of the attributes, and thus all are eternal.

Q.E.D.
Note .-- This proposition is also evident from the manner in which (in Prop.