John Wesley on Exodus 3:6

I am the God of thy father - He lets him know it is God that speaks to him, to engage his reverence, faith and obedience. Thy father, thy pious father Amram, and the God of Abraham, Isaac, and Jacob, thy ancestors. Engaged to them by solemn covenant, which I am now come to perform. And Moses hid his face, for he was afraid to look upon God - The more we see of God, the more cause we shall see to worship him with reverence and godly fear. And even the manifestations of God's grace should increase our humble reverence of him.