I found this statement from the Sabbath School Lesson, quite interesting.
"The Old Testament’s suggestion of plurality provides hints about the nature of the inner being of God. When we couple this with the New Testament’s statement about Jesus Christ and the Holy Spirit, we start to realize that there’s a lot about God’s nature that we don’t fully understand and probably never will. The triune aspect of God is one mystery, among many, with which we will have to learn to live." SabbathSchool Lesson, Oct, 2012, p17
What I found interesting in the above statment is the notion that how the old testament suggestion of plurality providing hints about the nature of the inner being of God. This language employed here has a degree of speculation ringing through it. The Word of God is clear in that it tells us explicitly that there is the Only True God the Father, and his only begotten Son, Jesus (John 3:16). God has revealed his nature to us, see the following quotes...
"And this is life eternal, that they may know thee, the only true God, and Jesus Christ whom thou hast sent" John 17:3
"Jesus saith unto him, Have I been so long time with you, and yet hast thou not known me, Philip? he that hath seen me hath seen the Father; and how sayest thou then, Show us the Father?Believest thou not that I am in the Father, and the Father in me? the words that I speak unto you I speak not of myself: but the Father that dwelleth in me, he doeth the works. Believe me that I am in the Father, and the Father in me: or else believe me for the very works' sake." John 14:9-11
"The Son of God came from heaven to make manifest the Father. "No man hath seen God at any time; the only begotten Son, which is in the bosom of the Father, He hath declared Him." John 1:18. "Neither knoweth any man the Father, save the Son, and he to whomsoever the Son will reveal Him." Matthew 11:27. When one of the disciples made the request, "Show us the Father," Jesus answered, "Have I been so long time with you, and yet hast thou not known Me, Philip? He that hath seen Me hath seen the Father; and how sayest thou then, Show us the Father?" John 14:8, 9.
In describing His earthly mission, Jesus said, The Lord "hath anointed Me to preach the gospel to the poor; He hath sent Me to heal the brokenhearted, to preach deliverance to the captives, and recovering of sight to the blind, to set at liberty them that are bruised." Luke 4:18. This was His work. He went about doing good and healing all that were oppressed by Satan. There were whole villages where there was not a moan of sickness in any house, for He had passed through them and healed all their sick. His work gave evidence of His divine anointing. Love, mercy, and compassion were revealed in every act of His life; His heart went out in tender sympathy to the children of men. He took man's nature, that He might reach man's wants. The poorest and humblest were not afraid to approach Him. Even little children were attracted to Him. They loved to climb upon His knees and gaze into the pensive face, benignant with love." Steps to Christ p11-12
If the above text from the Sabbath School lesson is telling us that the nature of God is but a mystery, with which we will have to learn to live, what was the point of Jesus coming to earth to reveal the Father? Or if God is a triune, and "...The triune aspect of God is one mystery, among many, with which we will have to learn to live." how would that logic stand next to Jesus promise on the heart of eternal life (John 17:3)? The logical conclusion would then be that eternal life would by-pass us and God's word would have had none effect.
The logic expreesed in the sabbath school statement suggests an element of speculation and confusion, which is another terminology given for the rider on the dragon, as depicted in revelation 17.
The Lords ways are unsearchable, yet he has revealed himself to us through the Word.
If we choose to follow him, he will reveal himself to us by his Word and his Spirit. Let us look to the Word of God, that we may choose this day whom we will serve.