7 “Look, he is coming with the clouds,”
and “every eye will see him,
even those who pierced him”;
and all peoples on earth “will mourn because of him.”
So shall it be! Amen.
8 “I am the Alpha and the Omega,” says the Lord God, “who is, and who was, and who is to come, the Almighty.”
9 I, John, your brother and companion in the suffering and kingdom and patient endurance that are ours in Jesus, was on the island of Patmos because of the word of God and the testimony of Jesus
John
the Revelator, the author of Revelation, had been exiled to the island
of Patmos for preaching the Gospel of Christ under the Roman Emperor Domitian. There is some
disagreement among scholars about whether the author of Revelations is John the Apostle
or another figure referred to as John of Patmos, due to linguistic and
stylistic differences in the writing of Revelations versus the books
attributed to John the Apostle including the Gospel of John. Wikipedia
page on John of Patmos: link
The end of verse seven is also translated as "all the tribes of the earth will wail because of Him." Presumably this means because so many people will realize that the teachings of the Gospels were accurate and will be terrified about what their fate is to become now that Christ has returned.
If you want to accept Salvation from Christ here are some resources:
A Prayer for Salvation from Christ:
Lord Jesus, I confess my sins and ask for your forgiveness. Please come into my heart as my Lord and Savior. Take complete control of my life and help me to walk in Your footsteps daily by the power of the Holy Spirit. Thank you Lord for saving me and for answering my prayer.
A more detailed step by step process:
https://www.wikihow.com/Accept-Jesus-Into-Your-Life