Why I Stress Perseverance

It sounds like you are protecting free grace to say that works are not necessary as an evidence of new birth, but it actually destroys free grace. This is true because it removes the necessary continuation of faith in God for internal transformation as a result of justification. One who believes that faith is a once-for-all activity will see no need for it to continue. But those who are dead earnest about continuing in faith and its results as the evidence of their justification will see faith as the absolutely necessary for the confirmation of their election and the assurance that God is absolutely for them! (cf. Romans 8)