We sometimes say we have changed because we have heard something that sounds good and we want to do it too. It could be to be nicer to others, not lie as much, not gossip, not throw your clothing on the floor, start washing your dishes on the day you use them ect.
We have to have the desire to change as a strong passion coming from the inside. Otherwise we will say the words and start with some actions to change but we will not have not changed on the inside, so the outside changes (actions) will most likely not last. No matter what the temporary appearance.
Isaiah 43:19
“Listen carefully, I am about to do a new thing,
Now it will spring forth;
Will you not be aware of it?
I will even put a road in the wilderness,
Rivers in the desert.