Contradiction with Proverbs 16:9
This verse suggests that a man plans his way, contrasting with the idea of settling it in the hearts not to plan a response.
Proverbs 16:9: A man's heart deviseth his way: but the LORD directeth his steps.
Contradiction with Matthew 10:19
It advises not to worry about defense or preparation in advance, yet implies divine preparation will occur, possibly conflicting with the specific directive in Luke 21:14.
Matthew 10:19: But when they deliver you up, take no thought how or what ye shall speak: for it shall be given you in that same hour what ye shall speak.
Contradiction with 1 Peter 3:15
This verse encourages believers to always be ready to explain their faith, seeming to contradict the notion of not preparing.
1 Peter 3:15: But sanctify the Lord God in your hearts: and [be] ready always to [give] an answer to every man that asketh you a reason of the hope that is in you with meekness and fear: [fear: or, reverence]