Every saint has a past, every sinner a future:

In the 5th century it was suggested that St Augustine could not possibly profess the Faith because he has previously been a great sinner.
Augustine suggested to his brothers in the faith, to such a statement they might reply, "Augustine is a bishop of the Catholic Church...He bears his burden and will
have to give an account of it before God. I met him in the company of good men.
If he is a bad man,he will know it. But even if he is good, it is not in him I have put my trust, because the first thing I learnt in the Catholic Church is not to put my hope in man...We are not doing our apostolate but Gods! because God has willed that this be so"...