Galatians 6:7 & 8
"Do not be deceived: God cannot be mocked. A man reaps what he sows. The one who sows to please his sinful nature, from that nature will reap destruction; the one who sows to please the Spirit, from the Spirit will reap eternal life." NIV translation
When we look with our physical eyes, it may seem that there are some who prosper without Jesus in their lives. They may have fancy homes, fancy cars, or be famous and adored by those around the world while many who wholeheartedly serve the Lord seem to have very little. This is the same thing that the worship leader, Asaph, experienced in Psalm 73. When he took what his physical eyes saw to God, he was shown their fate through his spiritual eyes. That is what Paul is reminding us of in this passage. Though it may seem like many are being blessed and reaping rewards of this world, in fact, they are headed for destruction. While it may seem that many who are walking in the Spirit serving the Lord are poor, they have eternal life and are storing up treasure in heaven.