At the conclusion of his sermon, Edwards says that those who are sinners, who have not yet been born again, must obtain salvation in order to escape God's wrath. As long as his listeners haven't died yet, they are "in the Land of the Living, and in the House of God, and have an Opportunity to obtain Salvation."
Edwards tells his listeners that this is a day of opportunity they should not let slip past them. Jesus is standing at the door and calling them, offering them mercy. Many are entering the Kingdom of God by coming to Jesus. People need to wake up and pay attention. They should join all the others who are "renouncing all youthful vanities, and flocking to Christ."
He emphasizes that a great awakening is happening: Many people, young and old, are turning to Christ. He urges his listeners not to miss out or they will regret it forever. They should join the ranks of those who are being converted. Finally, in the last paragraph of his sermon, he urges anyone who is not already "in Christ" to "awake and fly from the wrath to come." They should "escape to the Mountain," that is, Jesus Christ, so that they will obtain mercy and salvation.