Let us be thankful to God for any achievements that we might accomplish in our ministry. Our work for God is truly by grace and there's nothing wrong in rejoicing in it. But there's something more important that we should rejoice in, the work of God in us. His work of transforming us into the image of His Son, our Lord Jesus, is the greatest and most wonderful work of all. This work is the foundation of all other work that we can do in His name and for His glory.