This verse is an interesting twist on the benefits of being a believer (“the righteous”). We usually talk about the “pie in the sky by and by,” but this verse is about the here and now. While life is sometimes very difficult for a believer, God promises – obligates Himself – to honor our righteous attitudes and actions in this life.
The same is also true for the “ungodly” and the “sinner” (unbeliever). Their eternal destiny is clearly stated in Scripture, but they must also know and expect to “reap what they sow” in this life, as well.
If I wasn’t a believer, this verse would make me very uncomfortable. But as a believer, I am banking on it! And, BTW, I am happy to report that it’s working!