The fight for JOY
"It will help us fight for joy if we realize why Paul calls it a good fight. First, it is a good fight because the enemy of our joy is evil. The enemy is unbelief, and the satanic forces behind it, and the sins that come from it. When you set yourself to combat the forces that try to make you delight in yourself or your accomplishments or your possessions more than in God, you oppose a very evil enemy. Therefore it is a good fight...
It is a good fight because it is not a struggle to carry a burden, but a struggle to let a burden be carried for us. The life of joy in God is not a burdened lift. It is an unburdened lift. The fight for joy is the struggle to trust God with the burdens of life. It's a fight for freedom from worry. It's a fight for hope and peace and joy, which are all threatened by unbelief and doubt about God's promises. And since freedom and hope and peace and joy are good, the fight to preserve them is a good fight...
The fight for joy is good because by it God is greatly glorified." John Piper