15 All the days of the afflicted are evil, but the cheerful of heart has a continual feast.The wisdom, the cheerfulness, the discipline (etc) that being within God's flock makes other parts of life significantly less impactful. Food and money are certainly great things to have, but they are only temporary satisfactions. There are plenty of rich full people who are dreadfully unhappy, but the esteem of God is powerful. However, that is not to say Christians are always happy. Life still happens and life is difficult. But as the title of the post and Psalm 84:10 says:
16 Better is a little with the fear of the Lord than great treasure and trouble with it.
17 Better is a dinner of herbs where love is than a fattened ox and hatred with it.
10 Better is one day in your courtsthan a thousand elsewhere; I would rather be a doorkeeper in the house of my God than dwell in the tents of the wicked.