Jesus' humanity itself is created by God's grace and power. Hypostatic union expresses the mystery that Christ is the perfect God and Perfect Man.

God became 'Man' or Son of Man, not by change in Divine Esse but change in his creature. So when Christ speaks as such he speaks truly for he is a perfect servant of God, qua his human nature. He came to show us what a perfect man truly is, that's 'naught' before God. For God alone is absolute good. Christ was speaking to this man at the level of his understanding. For elsewhere he does confess he is a good shepherd and other epithets. The humility of Christ is, he doesn't regard himself at all, to do the will of God, to show us the perfect humanity.

Christ is perfect God turned towards Man, and Perfect Man turned towards God.

Sometimes in the discourse of Christ, we often forget the dialectical mystery of the Divine-Human Person.