Plotinos: Complete Works, v. 3 In Chronological Order,...

Nor can we ignore an objection raised by an opponent who is difficult to convince (Plato's Philebus): "Well, my friends, what then is this entity that you celebrate in such pompous terms, ceaselessly repeating that life and intelligence are goods, although you said that the Good is above them? What sort of a good might the Intellect be? What sort of a good should (a man) have, who thinks the Ideas themselves, contemplating everything in itself? Perhaps, indeed, a man, when he enjoys these (Ideas and contemplations), might be deceived into calling them a good merely because he happened to be in pleasant circumstances; but should these circumstances become unpleasant, on what grounds would he call them a good? Merely because they (possess) existence? But what pleasure or benefit could this afford him? If he did not consider self-love as the foundation thereof, what difference could there be for him between existence and non-existence? It is therefore to this natural physical error (of self-love), and to the fear of death, that we must trace the cause of the ascription of good to intelligence and life."118