Example 1
Premise→ True criminal minds can’t be rehabilitated.
Conclusion→A person who has a true criminal mind can’t rehabilitate.
The premise “True criminal minds can’t be rehabilitated.”is not a truth,not a reality.So the conclusion based on it can’t be convincing.
Example 2
Premise→ The Bible says “all scripture is given by inspiration of God”.
Conclusion→People should do as the Bible says.
Both the premise and the conclusion are from the same book Bible , this means using itself prove the conclusion. It has no power.