John J. Stewart writes an influential defense of the Church's policy on the priesthood ban.
John J. Stewart, Mormonism and the Negro (Orem, UT: Bookmark, Community Press, 1960), 20
I now propose to show three important truths: (1) that the LDS doctrine of not allowing the Negro to bear the Priesthood is entirely consistent with both of the two great attributes of God himself, the attributes of JUSTICE and MERCY; (2) that in this matter of the Negroes' not holding the Priesthood we can gain a much clearer insight into those basic Gospel principles of FREE AGENCY, FORE-ORDINATION, and ETERNAL PROGRESS; (3) that a belief in the correctness of this doctrine is consistent with other beliefs and practices in daily life which we seldom if ever question.