2 Corinthians 5:17
So if anyone is in Christ, he is a new creature; old things happened; behold, all are made new.
Source
The world is changing and changes are necessary in every way in human life since we are not static but changeable only that there are changes for good and others for evil.
Christians need constant changes but for the good to from time to time dust off our soul, because the changes to our life do us good are necessary to be able to advance and achieve goals.
So the changes are good for us to travel also in a world that escambiante, However, although the world is changing and we also what should not be changing are our values and Christian principles, they must remain in us until we finish the career.
God has new plans for us as well as changes for our lives therefore we must trust that God's plans are better than ours and that each morning we expect something better with the certainty that their wonderful purposes will reach us for good.
We have to keep in mind that when we have an encounter with Jesus and immediately there comes a wonderful change in all areas of our lives as we are often dragged with so many things that totally impede our relationship with God.
That is why it is necessary to be a new creature when we walk with him.
Everyone who has an encounter with God can not remain the same