The following argument is posted here by permission given by Michael Burgos from www.grassrootsapologetics.org
Oneness Pentecostals affirm objective morality. Either the morality posited by Oneness Pentecostals is morally good because it is by essentially (or by nature) morally good, or the morality posited is morally good because God commanded it. In the first case that which is objectively morally good transcends the Oneness God and therefore makes the Oneness God subservient to it, which neccesitates that God is inferior to the objective morality. In the second case objective morality is an illusion because it is arbitrarily decided by the Oneness God.
Trinitarianism essentially avoids this dilemma because the Trinitarian God consists of an eternal interpersonal relationship between the Father, Son, and Holy Spirit. It is within this eternal relationship wherein love eternally exists between the Father, Son, and Holy Spirit and is reflected from the character of the Triune God. It ought to be recognized that the summation of the moral Law is love (Rom 13:8, Gal 5:14, Jas 2:8).
Oneness Pentecostals affirm objective morality. Either the morality posited by Oneness Pentecostals is morally good because it is by essentially (or by nature) morally good, or the morality posited is morally good because God commanded it. In the first case that which is objectively morally good transcends the Oneness God and therefore makes the Oneness God subservient to it, which neccesitates that God is inferior to the objective morality. In the second case objective morality is an illusion because it is arbitrarily decided by the Oneness God.
Trinitarianism essentially avoids this dilemma because the Trinitarian God consists of an eternal interpersonal relationship between the Father, Son, and Holy Spirit. It is within this eternal relationship wherein love eternally exists between the Father, Son, and Holy Spirit and is reflected from the character of the Triune God. It ought to be recognized that the summation of the moral Law is love (Rom 13:8, Gal 5:14, Jas 2:8).
