Jesus was born of the very eternal Father of Heaven who is immortal. Jesus was also born of Mary who was a mortal and part of the heritage of fallen man. Jesus is known as a being who did no sin in his life on earth. What do you believe? Was Jesus like the rest of us or was he more than this mortal race?
Its all contained within the record revealed in the Holy Scriptures. In order to comprehend the answer that you seek you must 1st read the information freely transmitted to man from God through the Holy Spirit of Truth. All scripture is inspired by God. (1 Tim. 3:16). No one can make you read this information, but it does exist.
God established a plan for man's salvation even before the foundation of the world. You asked about the essence of Christ Jesus, Jesus lived a duplicate life........He had the "essence" of God the Father (what else can the son of God be other than God?).........the Son of God....He also was physically human and called THE SON OF MAN. He was God "incarnate"...........in order for man to walk this life totally innocent and free from sin, God had to take the physical form of man in order to fulfill the requirements of the Old Covenant, i.e., THE LAW/The Law of Moses.
As declared in scripture.........God had a plan to provide a path for man's salvation before time itself began, before the world was formed (1 Peter 1:20, 2 Tim. 1:9), that plan was fulfilled with the birth, life, death/sacrifice and ascension of Jesus. In order for this plan to be effective.......God chose a lineage, a seed of man that was loyal and faithful to God. That seed begins with father Abraham.....the very origin of what's known today as a Christian Nation.....Christianity. (Gal. 3:28-29).
In order to demonstrate the faith of Abraham, God commanded him to sacrifice his son on the alter as a blood offering (all life is found in the blood). God stayed the hand of Abraham before the sacrifice would take place having proven the faith of Abraham.
The sacrifice of Jesus (the only begotten of the Father/God) was a mirror image of a demonstration of God's faith in man.....that man was worth saving because of the love a Father has for His Son. Love is everything, you can't define it, you can only "feel" it......you know that it exists but its based upon the faith of the one making a declaration of love. "Greater love hath no man than this, that one lay down his life for his friends." -- John 15:13
The scriptures tell us that God hid this plan from mankind for awhile, until the time God would reveal it (Eph. 3:5,). It was even hidden from the prophets who foretold of its coming, as they did not comprehend the message they were revealing (1 Peter 1:10-12)
The scriptures also tell us that this plan was finally revealed at the correct time, a time of God's choosing and it was revealed through the Holy Spirit of Truth as directed by Christ Jesus to the disciples and apostles of Christ. (Eph. 3:5, 1 Peter 1:12)
We are told that when we read about this plan, WE CAN UNDERSTAND IT, the mystery is revealed to all. (Eph. 3:4). We are even COMMANDED TO UNDERSTAND THE WILL OF GOD (Eph. 5:17). And we are told that God desires that we all come to the knowledge of this truth and find salvation (2 Tim. 2:3,4).
God desires it........then, it is possible. But first one must read for themselves to test the truth of what's being spoken, the Word of God is our only weapon against the deceit of the god of this world......... our enemy is a liar and the father of all lies. (John 8:44). Lies and Deceit is the method that is used against man......it can only work if one believes a lie to be true.
Thus the MISSION STATEMENT of CHRIST JESUS........the reason for Jesus' existence upon earth, Jesus' purpose was to TEACH the TRUTH from Heaven.
YOUR ANSWER: Who was Jesus, what was His essence, what was His mission on earth.
"Pilate therefore said unto Him (Jesus), art thou a king then? Jesus answered; Thou sayest that I am a king. To this end was I born, and for this cause came I into the world, THAT I SHOULD BEAR WITNESS TO THE TRUTH; EVERYONE THAT IS OF THE TRUTH, HEARETH MY VOICE." -- John 18:37