Christ is the perfect high priest appointed by God a mediator for all time

Hebrew 5:1-14
Christ is the high priest who is called by God. So Christ also is not take upon himself the glory of becoming a high priest. But God said to him, " You are my Son; today I have become your Father.: "You are a priest forever, in the order of Melchizedek."
Although he was a son, he learned obedience from what he suffered and, once made perfect, he became the source of eternal salvation for all who obey him.
Aaron was appointed by God as the first high priest of Israel He was the intermediary between a holy God an a sinful people, the go-between who represented each to the other.
Why?
The Jewish religion - the system these Jewish Christians were tempted to return to - still had its high priest. But in Christ, the writer says, we have a high priest who fulfills all the statutory requirements, and far more, because he has no need to atone for his own sins. He is the perfect high priest appointed by God a mediator for all time.
Jesus Christ is the high priest but but not chosen among man but in the order of Melchizedek. He is from the Lord, so he is a priest forever.
For his close relation with God and his obedience and he make perfect so Jesus can be the source of eternal salvation for all who obey him. If one who does not obey him won't have the salvation. Believe in Jesus Christ as savior is the only way to get eternal life.
How?
Jesus is the high priest forever and appointed by God, there is not question. So just trust in Him you will be saved.