Immunity to Manipulation, Step 2

 Think logically instead of solely using emotion. 

 React to what the words mean rather than how the words make you feel. 

 Assess statements by whether they are consistent, not by whether they make you feel jangly. 

 Be capable of thinking strategically, which, banally, means thinking about later emotional states. Thinking about how the consequences will feel in the future, rather than how actions feel in the present. 

 Nearly all mortals are immune to logic, rather than immune to manipulation.

 I suspect this ability is born, not learned. Usually the only feasible way to avoid manipulation is to be strict with ingroup/outgroup. Never listen to the outgroup. Unless you're a spy, and your job is espionage, it's not your job. This in turn means getting lucky with your pope. If you avoid manipulation this way, what do you do if your priest tries to manipulate you? You get pwned, that's what you do.