When the Lord saw that Leah was hated That is, loved less than Rachel, in which sense it is required that we hate father and mother, in comparison with Christ, Luke 14:26, then the Lord granted her a child, which was a rebuke to Jacob for making so great a difference between those he was equally related to; a check to Rachel, who, perhaps, insulted over her sister upon that account; and a comfort to Leah, that she might not be overwhelmed with the contempt put upon her.
Related Commentaries of Genesis 29:31
Genesis 29:31
31 And when the LORD saw that Leah was hated, he opened her womb: but Rachel was barren.