Joy for a Christian is a gift from God. Just as our salvation cannot be bought or earned, joy cannot be bought or earned by ourselves. Joy is the visible fruit that comes from a relationship that is pleasing to God; it is not something we can create by our own efforts
Romans 15:13 says "May the God of hope fill you with all joy and peace as you trust in him, so that you may overflow with hope by the power of the Holy Spirit."
