The most authoritative proof that “old things must pass away to live a successful Christian life” can be found in the Bible.
One of the most obvious approaches Jesus took to engage marginalized people was to include them into the fold as subjects worthy of receiving salvation. The second; exemplifying compassion for the lost, hurt and hopeless.
The Great Commission emphasizes how important spreading the Gospel to others was to Jesus. Here we see that Jesus is not selfish. Simply stated, He is not comfortable nor satisfied with letting others perish spiritually.