Your obedience is not the bedrock of your assurance. Given the remains of sin within us it can be profoundly difficult to give a clear measure of our own spiritual growth. In fact I have been known to argue that the better we get the worse we seem to ourselves. That is, as we grow in grace we grow in our capacity to see our own sin more deeply. Which the devil delights to use to discourage us. It is Christ’s obedience that secures for us our eternity.