To be transformed is to have a complete change and transformation. It is renewing your mind.

Romans 12:2 (HCSB) Do not be conformed to this age, but be transformed by the renewing of your mind, so that you may discern what is the good, pleasing, and perfect will of God.

It's time that we start to allow God to transform the way we think. Not according to the world's way of thinking but the way the Word of God says to think.