The Ticket is already paid for

For we hold that one is justified by faith apart from works of the law. (Romans 3:28 ESV)

There is not enough good that one could ever do to fulfill the law.  Jesus  came to fulfill the requirement of the law and shed His blood once and for all, even saying as He died on the cross, "It is finished".  Salvation is through faith in Jesus by God's grace, NOT by works.  You can NOT earn your way into Heaven...the ticket is already paid for, all you need do is accept it.