Romans 12:2 (NKJV)
Metamorphosis is the biological process of change that takes place in the life of an animal or insect. This process of transformation is something that occurs naturally as an animal or insect matures into adulthood. If there were no change, no metamorphosis, then something would be wrong. This process of transformation can take anywhere from a few days to a few weeks depending on the animal or insect, but no matter the length of time that is involved the important thing is that the transformation does take place.
The English word metamorphosis comes from a Greek word and it was that same Greek word that Paul used in Romans 12:2 when he talked about believers being transformed by the renewing of their mind. This transformation is a normal process that happens when a Christian grows and develops spiritually. How long this process of transformation takes depends on the person, for some the changes may happen faster than for others. Someone looking at the process from the outside may not notice that any changes are taking place at the time, but a transformation is happening.
There are areas in all of our lives that need to be changed and developed, we need to be transformed into who and what God wants us to be. This process is necessary for us to mature into spiritual adulthood and if no changes are taking place then something is wrong. Paul talked about being transformed by the renewing of our mind, which means we line up our thinking and our lifestyle with what we see in the Bible. As we do our part in the transformation process by reading, studying, and doing Gods' Word we will find a metamorphosis taking place in our life.