Jesus illustrates the reason for His coming into the world by illustrating His design, and the efficacy of his coming, by a reference to the case of the brass serpent, recorded in Numbers 21:8-9. O

JESUS says: Just as Moses lifted up the serpent in the desert on a pole, so must, so it is necessary that the Son of Man be lifted up on the cross, [Num. 21:9.]

In order that everyone who believes in Him [who cleaves to Him, trusts Him, and relies on Him] may not perish, but have eternal life and actually live forever!

For God so greatly loved and dearly prized the world that He even gave up His only begotten (unique) Son, so that whoever believes in Him shall not perish (come to destruction, be lost but have eternal (everlasting) life. (John ‭3:14-16)‬

For God did not send the Son into the world in order to judge (to reject, to condemn, to pass sentence on) the world, but that the world might find salvation and be made safe and sound through Him.

He who believes in Him is not judged, he who trusts in Him never comes up for judgment; for him there is no rejection, no condemnation–he incurs no damnation;

The message of the cross is foolishness to those who are perishing, but to us who are being saved it is the manifestation of the Power of God.
‭‭I Corinthians‬ ‭1:18‬ ‬

The Message of Christ (the Messiah) crucified, the message which to the Jews is a scandal and an offensive stumbling block, that springs a snare or trap, and to the Gentiles it is absurd and utterly unphilosophical nonsense.

But to those who are called, whether Jew or Greek (Gentile), Christ is the Power of God and the Wisdom of God.”
‭‭1 Corinthians‬ ‭1:23-24‬ ‬

It is from the Presence of God in, Being Born of the Spirit of God that you have your life in Christ Jesus, Whom God made our Wisdom from God, revealed to us a knowledge of the divine plan of salvation previously hidden, manifesting itself as our Righteousness from God, [thus making us upright and putting us in right standing with God, and our Consecration from God, making us pure and holy, and our Redemption from God, [providing our ransom from eternal penalty for sin. (1 Corinthians ‭1:30‬)

But the natural, nonspiritual man does not accept or welcome or admit into his heart the gifts and teachings and revelations of the Spirit of God, for they are folly (meaningless nonsense) to him; and he is incapable of knowing them [of progressively recognizing, understanding, and becoming better acquainted with them] because they are spiritually discerned and estimated and appreciated.(1 Corinthians ‭2:14‬)

But the spiritual man tries all things [he examines, investigates, inquires into, questions, and discerns all things], yet is himself to be put on trial and judged by no one [he can read the meaning of everything, but no one can properly discern or appraise or get an insight into him.” (1 Corinthians ‭2:15‬)

For you are the sweet fragrance of Christ unto God, among those who are being saved and among those who are perishing: To the latter it is an aroma scented from death to death [a fatal odor, the smell of doom]; to the former it is an aroma from life to life [a vital fragrance, living and fresh. (2 Corinthians ‭2:15-16‬)

Now has come–the salvation and the power and the kingdom (the dominion, the reign) of our God, and the power (the sovereignty, the authority of His Christ (the Messiah); for the accuser of the brethren, who keeps bringing before our God charges against them day and night, has been cast out! [Job 1:9-11]

And they have overcome (conquered) him by means of the blood of the Lamb and by the utterance of their testimony, Revelation ‭12:10-11‬

There is wonder working power in the blood of Jesus Christ, the Lamb of God.

The Father has delivered and drawn us to Himself out of the control and the dominion of darkness and has transferred us into the kingdom of the Son of His love, In Whom we have our redemption through His blood, which means the forgiveness of our sins.”
‭‭Colossians‬ ‭1:13-14‬ ‬

The blood of Jesus provides the only solution to your greatest problem, being born into a fallen world, dead by your own shortcomings and trespasses, ‭with no hope of recovery. ‬

The pain of sin and death are immediately attached to your fallen nature and put into perpetual motion the ravages of death, each day drawing me closer to my eternal demise.

Apart from the redeeming power of the Blood of Jesus Christ, you are doomed. But God being so rich in His mercy! Because of and in order to satisfy the great and wonderful and intense love with which He loved us, l‭God demonstrated His own love for me in that while I was still a sinner, Christ died for me (Ephesians 2:5, Romans 5:8). Thus, your Greatest Problem is solved!‬

The blood of Jesus is eternal. Within it is the very life of God

God Even when further were being dead (slain) by our own shortcomings and trespasses, He made us alive together in fellowship and in union with Christ; He gave us the very life of Christ Himself, the same new life with which He quickened Him, for it is by grace (His favor and mercy which you did not deserve) that you are saved, delivered from judgment and made partakers of Christ's salvation. ‭‭Ephesians‬ ‭2:4-5‬ ‬

Yes, God raised us up together with Him and made us sit down together giving us joint seating with Him in the heavenly sphere, by virtue of our being in Christ Jesus.

He did this that He might clearly demonstrate through the ages to come the immeasurable (limitless, surpassing) riches of His free grace (His unmerited favor) in His kindness and goodness of heart toward us in Christ Jesus.
‭‭Ephesians‬ ‭2:6-7‬ ‬