maybe some sermons on this topic:

15 "Beware of false prophets, who come to you in sheep's clothing but inwardly are ravenous wolves.
16 You will know them by their fruits. Are grapes gathered from thorns, or figs from thistles?
17 So, every sound tree bears good fruit, but the bad tree bears evil fruit.
Matthew 7:15-17 RSV-CE

14 they are those who hear, but as they go on their way they are choked by the cares and riches and pleasures of life, and their fruit does not mature.
Luke 8:14 RSV-CE