Steadfastness in direction is very important, especially after a victory.
We can use this scripture as direction:
Jesus said ... If you continue in my word then are you my disciples indeed. and you shall know the truth and the truth shall make you free. Jn. 8
We really can't afford to relax after a victory. Devil is just waiting for the entrance to destroy us.
I Peter 5 ... 8 Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour:9 Whom resist stedfast in the faith, knowing that the same afflictions are accomplished in your brethren that are in the world.
We must continue to turn to God and seek wisdom from God rather than being wise in our own eyes. We must deal with destructive thoughts by taking such thoughts to God. We must reject ways of devils which are opposite to God. And we must do these things as long as we live on this earth.