Every now and then, someone would use the book of Isaiah to try and prove that God is a Trinity. In effect, these advocates of the Trinity doctrine are saying that the God of Isaiah was a triune one. But is this true? Let us examine.
“ Keep silence before ‘ME,’ O islands; and let the people renew their strength: let them come near; then let them speak: let us come near together to judgment.  ‘WHO’ raised up the righteous ‘man from the east…'” — Isaiah 41:1,2
Who was the “ME” speaking here? According to verse 2, it’s the Person that “raised up the righteous ‘man’ from the east.”
Let’s identify this “righteous man from the east” first, then we’ll go back and identify the “Me” that raised this man up.
“In those days, and at that time, will I cause the ‘Branch of righteousness’ to GROW UP unto David; and HE shall ‘execute judgment and righteousness in the land.'” — Jeremiah 33:15
This “Branch of righteousness” was called a “he,” therefore a “man of righteousness.”
“ And speak unto him, saying, Thus speaketh the Lord of hosts, saying, Behold the ‘MAN’ whose name is The Branch; and ‘he shall grow up out of his place,’ and he shall build the temple of the Lord:  Even he shall build the temple of the Lord; and he shall bear the glory, and shall sit and rule upon his throne; and he shall be a priest upon his throne: and THE COUNSEL OF PEACE shall be between them BOTH.” — Zechariah 6:12,13
The “man” whose name is the Branch is the One included in the counsel of peace of the Lord, and as we also read in Jeremiah 33:15, he will execute judgment and righteousness in the land.
“ Declaring the end from the beginning, and from ancient times the things that are not yet done, saying, My counsel shall stand, and I will do all my pleasure:
 Calling a ‘RAVENOUS BIRD’ ‘FROM THE EAST,’ the ‘MAN’ that EXECUTETH MY COUNSEL from a far country: yea, I have spoken it, I will also bring it to pass; I have purposed it, I will also do it.” — Isaiah 46:10,11
This “man” called to execute the counsel of the Lord, is depicted as a “ravenous bird” from the east.
Why a ravenous bird? A hungry bird was used to symbolize angels (Mark 13:4,19), unfortunately in this parable of the sower, it was used for the evil angels devouring the good seed, but angels nonetheless. An angel is a messenger of Heaven, and this “righteous man,” called a ravenous bird from the East is a Messenger of Heaven. Ravenous, seeking to devour, or destroy.
“He that committeth sin is of the devil; for the devil sinneth from the beginning. For this purpose the Son of God was manifested, that he might destroy the works of the devil.” — 1 John 3:8
It is now quite obvious that the “righteous man from the east” was none other than the Lord Jesus Christ.
He is the One included in the counsel of peace, called to execute the counsel of God.
“ For as the Father hath life in himself; so hath he given to the Son to have life in himself;  And hath given him authority to execute judgment also, because he is the Son of man.  I can of mine own self do nothing: as I hear, I judge: and my judgment is just; because I seek not mine own will, but the will of the Father which hath sent me.” —John 5:26,27,30
Now that we know who was the “righteous man from the east,” then the “Me” in Isaiah 41:1, that raised up Jesus Christ to execute His will should be quite obvious, it is God the Father.
Why is this important to know? Because by correctly identifying the Son, we can have the true knowledge of the God that the prophet Isaiah talked about throughout his book.
The Father said through Isaiah:
“…I the Lord, the first, and with the last; I am he.” — Isaiah 41:4
“Fear thou not; for I am with thee:
be not dismayed; for I am thy God…” (ibid v. 10)
“I am the Lord: that is my name:
and my glory will I not give to another…” (42:8)
“I, even I, am the Lord; and beside me there is no saviour.” (43:11)
“I am the first, and I am the last; and beside me there is no God.” (44:6)
“…Is there a God beside me? yea, there is no God; I know not any.” (ibid v. 8)
The God of Isaiah was not a triune one, but only one, the Father.