We cannot save ourselves. We can surrender to Jesus Christ believe in him and give our lives to him. We can serve others selflessly and love selflessly but we cannot save ourselves. Our salvation is in the hands of God. However, if we know God well enough, we love others, serve others, and try to bring the kingdom of God to this earth then we know we are going to be with God in heaven. We also know that we did not earn that salvation but our belief in God will bring us so close to God that we know he will want us with him then like he does now.