The Enneads, a work from the great philosopher Plotinus, has exerted a considerable influence on Western civilization, including our present time. Plotinus himself was taught by Ammonius Saccas, the "theodidactos", or God-taught philosopher in Alexandria who brought several philosophical systems together in his Neo-Platonic School.
Those of this School were known as the "Philalethians" (lovers of the truth); while others named them the "Analogists," on account of 'their method of interpreting all sacred legends, symbolical myths and mysteries, by a rule of analogy or correspondence' as indeed one can find in the writings of Porphyry.
In his Enneads he treats of the following topics:
First Ennead: Human or ethical topics;
Second and Third Enneads: cosmological subjects or physical reality;
Fourth Ennead: about the Soul;
Fifth Ennead: knowledge and intelligible reality;
Sixth Ennead: Being and what is above it, the One or first principle of all.