Many people fear that the doctrine of the eternal generation of the Son implies a sort of subordination of the Son to the Father, as the Son is dependent upon the Father for his being. However, Gregory is able to reverse this sentiment and say that the Father is dependent on the Son for his being. To be a father, after all, is to have a son. Gregory explains:
For he who truly believes in the One sees in the One Him Who is completely united with Him in truth, and deity, and essence, and life, and wisdom, and in all attributes whatsoever: or, if he does not see in the One Him Who is all these it is in nothing that he believes. For without the Son the Father has neither existence nor name, any more than the Powerful without the Power, or the Wise without Wisdom. For Christ is ‘the Power of God and the Wisdom of God,’ so that he who imagines he sees the One God apart from power, truth, wisdom, life, or the true light, either sees nothing at all or else assuredly that which is evil. For the withdrawal of the good attributes becomes a positing and origination of evil.
~ Against Eunomius 2.4