In a 1982 letter to a wife of a pastor who had been asked to resign, Jack describes how the New Testament reality of sonship came home to him personally.
My life's whole strength lies in that God has kindly imparted a confident knowledge of His Fatherhood.
I may have a better knowledge of the Father than do other people. But would you believe that this knowledge really began with the death of my own father? He was killed in a hunting accident when I was two years old. A senseless hunting accident. A piece of foolishness. Yet I am not bitter, and am grateful to God for the perfection of the plan.--The Heart of a Servant-Leader: Letters from Jack Miller (P&R, 2004), 276-77
The emptiness, the dark nights when I was afraid as a small child to go to bed for fear I too might disappear, led me By God's grace to seek God as Father, to know what Fatherhood meant, to give up self-pity and self-awareness and walk in the confident knowledge of my heavenly Father's love. . . . I love my Father in heaven and trust one day to see my earthly father and to join him in praising God for the marvel of a plan that is sound beyond ordinary human understanding.