T. Austin-Sparks emphasizes David's spiritual greatness as a key characteristic of effective leadership, illustrating how despite numerous obstacles, including familial rejection and personal failures, David's heart for God and sense of responsibility set him apart. He highlights David's respect for God's anointing, his lament over Saul's death, and his ability to adjust after mistakes as essential traits for leaders. David's deep concern for the House of God and his honest reflection on his own sins further demonstrate the qualities that God values in a leader. Ultimately, Sparks asserts that true leadership is rooted in spiritual measure rather than mere human appointment.