God’s Word results in a harvest of “good fruit” if we hold on fast to it in our hearts. In the same way, we can turn the words we hear from people we trust into curses that bear “bad fruit”.
For example, a man who trusts a doctor that says he will never recover from his medical condition is unlikely to be able to receive God’s miraculous healing, no matter how many times he prays. The doctor’s words (based on a human being’s limited knowledge and not on God) has become an unintended curse. The man must take down such a stronghold through repentance and renunciation, before his relationship with God can be restored.
Luke 8:15 ESV As for that in the good soil, they are those who, hearing the word, hold it fast in an honest and good heart, and bear fruit with patience.
Psalm 146:3 NLT Don’t put your confidence in powerful people; there is no help for you there.