Genesis 30:2

And Jacob's anger was kindled against Rachel; and he said, Am I in God's stead, who hath withheld from thee the fruit of the womb? The stern reproof of Jacob was fully deserved by Rachel: In the place of God am I supposed to be, who has denied thee children? He was powerless so far as his own strength was concerned, and probably, together with Rachel, did not make a sufficient use of prayer as a power to storm the heart of God.