Ec 3:14 I know that whatever God does, It shall be forever. Nothing can be added to it, And nothing taken from it...
Let's apply this verse to salvation. Whatever God does is perfect. Nothing can be added to it and nothing can be taken from it. Realize that God has done everything that is absolutely necessary in Christ Jesus for our salvation.
You don't have to add anything to it. You don't have to take anything from it. You don't have to improve on it. All you need to do is to place your trust in the Savior and what He did on the cross for our salvation.