but, speaking the truth in love, may grow up in all things into Him who is the head - Christ -"
Ephesians 4:14-15 (NKJV)
Every school year there are graduations. Graduation is not really an end but a time of transition. For example, those who are graduating from a high school are transiting into college or university, some trade school, or into the work world. Those people graduating from college, university, or some other school are transiting into a time when they will put all of the things they have learned to use. To have a graduation, or a transition, means that there has been some development. Without learning, growth, and development a person will have no transition or graduation but they may have to do more courses or go back to redo the school.
Spiritually we are in a continual state of learning, growth, development, and even graduating from one level of spiritual maturity to another. The Bible talks a lot about spiritual growth and development. In Ephesians 4, and in other places, Paul talked about believers growing up and doing their part in the plan of God. Paul said in Ephesians 4 that we need to stop being children who are so easily swayed and grow up in all things. We need to know who we are in Christ and take our place in the Body of Christ so that we are able to do our part and contribute to God's work in the earth.
As Christians we should be growing from one level of spiritual development into another. But for us to graduate and move into another level of spiritual maturity we need to learn and grow. If we do not learn, grow, and develop then we will not move forward in the plan and purpose that God has for our life. Spiritual growth and development come through learning God's Word and putting it into practice in our lives. God needs mature, spiritually developed believers to help carry out His plan on the earth; if we remain spiritual children, we limit the amount of things God can do through us.