From The Sadness of Christ:
If we mishap to see any man stray far out of the way, let us still have good hope that at last he
will return again, and in the mean season in humble wise incessantly pray, that both it may please God
to grant him grace to amend, and that he likewise for his part, by God’s help, may gladly receive it, keep
it when he hath it, and neither sinfully cast it off, nor through his own sloth wretchedly after lose it.
Saint Thomas may have had his son-in-law Roper in mind when he wrote this, Roper being transformed from a passionate Lutheran to a passionate Catholic.
I love St. Thomas More.