Why is Jacob's marriage to Leah significant in biblical theology?

In Jacob's marriages to Leah and Rachel, we see a profound theological significance. Leah, described as tender-eyed and less favored, symbolizes humanity's sinful condition inherited from Adam. Her marriage to Jacob illustrates the necessity of satisfying God's justice and fulfilling the law before the Church, represented by Rachel, can be redeemed. This typology reflects the truth that Christ had to unite with humanity, dealing with sin and fulfilling the law, before He could present His bride holy and blameless before God.