This thought came up after visiting my physician, who is major time overwieght and giving me lecture on being 2 pounds over.
Examples :
1. Investment suggestions by a person who himself if failure in investing.
2. Suggestions by less educated persons to people, to study more.
3. Relationship experts preaching on how to ensure a good relationship, while thier own personal life is in a mess.
Debate : Professionals preaching / lecturing pupils even if they lack to follow thier own principles, IMMORAL?