My thoughts on Genesis 5.
[Adam] Man (is) [Seth] appointed [Enosh] mortal [Cainan] sorrow, (but) [Mahalelel] the Blessed God (who is JESUS) [Jared] shall come down [Enoch] teaching (that) [Methuselah] His death shall bring [Lamech] powerful [Noah] rest.
"The Man is an appointed mortal sorrow" which means that we are sinners. We came into this world with Sin which means "separation of God".
The Blessed God who is Jesus came to this world with Love, Compassion, and ready to Save us! Ready to Heal us! Not to condemn us but to show us the way of Salvation. In John 14:6 (KJV) "Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by Me."
He came to show us the way by " teaching " us that "His Death shall bring us Salvation and Powerful Rest". This means that our Sins are forgiven by His Blood, His Death, and His Resurrection. He's our redemption, our salvation, and our only way to Heaven. We can Rest knowing that we are saved by Grace, not by our performance but by His finished performance on the Cross. Our duty is just believe in Jesus as our Savior and His finished work.
Isn't that amazing. Even names in the Bible have beautiful meanings! God bought Jesus to the earth so that we can learn that Christ's Death bring us REST. The kind of Peace that the world can't give us but Jesus only. He will give us peace when we magnify His name and Trust in the Lord. The more we focus in Him, the more we can receive His Refreshing and Rest.
It's also amazing that there are 10 names that I mentioned up there. 10 in the Bible means Holy just as His 10 Commandments. Since we can't follow His Big 10's perfectly , Christ taught us that His Death will bring Rest in us because He have fulfilled the 10 Commandment for us. The more we are have Jesus in our Hearts and Minds, the more we will sin less because Sin have no dominion over us and because we are new creations in Christ, we are no longer of the flesh about of the Spirit.