Philippians 3:12-14 (NKJV)
The Apostle Paul did many great things for God. Paul traveled to many different places to preach the Gospel and to start churches. Paul was someone who was very well educated and had a great revelation from God concerning who we are in Christ. But, even with all of his education and understanding of God, Paul still realized that he did not know everything and there was room for growth and development in his life. This is also true in our lives, no matter where we are naturally and spiritually there is always room to grow.
Any honest Christian knows that there is always room for more spiritual development. The Bible talks about spiritual growth and there are several things we can do to grow up spiritually. We need a continual diet of God's Word, we need to spend time talking to God in prayer on a regular basis, and we need to be involved in what God is doing in the world today. We need to be an active member of our local church as well as being involved in what God is doing around the world. Paul said that he was not "perfected" but he kept moving forward so that he could do the things that God had called him to do.
We need spiritual growth but we can use some natural training and development too; we can find ways to improve what we do in the natural side of life. There are classes we can attend, there are books we can read, and we can ask God for wisdom and insight so that we can be better in whatever we do. If we realize that we will always have room for growth and apply ourselves to learn and develop in every area of our life we will be more effective for God and more productive in everything that we do.