Why is understanding human nature important for Christians?

The Christian doctrine teaches that, due to the Fall, humanity is fundamentally in a state of sin and darkness, as reflected in Ephesians 5:8, which states, 'For you were once darkness, but now you are light in the Lord.' Recognizing our true nature helps us grasp the depth of God's grace and the necessity of Jesus's sacrifice. It underscores that humans cannot save themselves, as our nature is inclined towards sin (Romans 3:23). This understanding promotes humility and dependence on God, driving believers toward the truth that only through Christ’s life can we transition from spiritual darkness to light, thus helping us appreciate the grace that has been bestowed upon us.