Why is there no need to work for salvation?
There is no need to work for salvation because the work of the cross is complete. Christ was resurrected, returned to glory, and revealed these truths, showing that believers are not under the commandments but under grace. Since everything needed has already been done, trying to work more adds nothing to salvation.
Les explains that a lady called confused because a sermon used Matthew 19 and the rich young ruler, while he had said believers are not under the commandments but under grace. He gave her a one-on-one Bible study through the Abrahamic covenants, Christ's earthly ministry, Israel's rejection, the raising of Saul of Tarsus who became the apostle Paul, and the revelation of the mysteries. Since the work of the cross was complete, Christ had been resurrected and gone back to glory to reveal these truths, there was now no need to work; it was all done. Her response was that this is logical: if it is all done, why try to work, work, work to do more? It is done. This is what the man is trying to get across. The passage then continues with Paul saying he went up to Jerusalem to see Peter and remained fifteen days.