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.