Before you follow anyone or listen to anyone, test and prove them.
Test such person and their life style. Do not just accept what they say or do without confirming for yourself.
If someone say one thing and you accept such person as your mentor or your leader or your counselor, this is not smart.
Test every words you hear, test every person to be sure you are not led astray. This way, you confirm everything for yourself and you are confident in what you believe.
Next post is–How to Test Everything