We must address ourselves to him as our Father, and must call him so. He is a common Father to all mankind by creation, Mal. 2:10; Acts 17:28. He is in a special manner a Father to the saints, by adoption and regeneration (Eph. 1:5; Gal. 4:6); and an unspeakable privilege it is. Thus we must eye him in prayer, keep up good thoughts of him, such as are encouraging and not affrighting; nothing more pleasing to God, nor pleasant to ourselves, than to call God Father. Christ in prayer mostly called God Father. If he be our Father, he will pity us under our weaknesses and infirmities (Ps. 103:13), will spare us (Mal. 3:17), will make the best of our performances, though very defective, will deny us nothing that is good for us, Lu. 11:11–13. We have access with boldness to him, as to a father, and have an advocate with the Father, and the Spirit of adoption. When we come repenting of our sins, we must eye God as a Father, as the prodigal did (Lu. 15:18; Jer. 3:19); when we come begging for grace, and peace, and the inheritance and blessing of sons, it is an encouragement that we come to God, not as an unreconciled, avenging Judge, but as a loving, gracious, reconciled Father in Christ, Jer. 3:4.
Henry, M. (1996, c1991). Matthew Henry's commentary on the whole Bible : Complete and unabridged in one volume (Mt 6:9). Peabody: Hendrickson (emphasis mine).
Father Abraham, Maria Hathaway Spencer