Why is total depravity a key doctrine in Reformed theology?

Total depravity is a foundational doctrine in Reformed theology, asserting that every aspect of humanity is affected by sin. Romans 3:10-12 articulates, 'There is none righteous, no, not one; there is none who understands; there is none who seeks after God.' This reflects the severity of human nature post-Fall, indicating that apart from God's grace, individuals are incapable of seeking or choosing God. This doctrine underpins our need for divine intervention for salvation, affirming that it is God's electing grace that draws the sinful heart to Himself. By recognizing our total depravity, we grasp the magnitude of grace that God extends towards us in Christ.