From
http://onepentecostal.com
Trinitarians must find some way to understand the Scriptural distinctions between Father, Son, and Spirit without confessing three different Gods, because Scripture is adamant that God is one. To do so, they constructed the notion of God having only one essence, but within that one essence existing as three distinct persons. Their emphasis on God's threeness is prevented from becoming a confession of three separate Gods only by qualifying it to say God's threeness subsists in one essence. Only by such a qualification can they preserve some form of God's oneness. Insisting on seeing the distinctions between Father, Son, and Spirit as distinctions of divine persons within one essence, in turn necessitated the redefining of "one" to mean unity, rather than a numerical oneness. When all is said and done, we end up with a view of God that seems contradictory at points, is said to be incomprehensible, and tends toward Tritheism. Trinitarianism seems to do justice to the meaning of a few passages, yet all the while violating the meaning of the majority.