Something obvious

I don't think it's possible to tell people how to feel, no matter how hard politicians, managers, bishops, parents etc., try. Unless you've had military training at resisting torture, you are going to feel as your gut takes you.

However I do believe that people can be helped to understand their own emotions, which is an entirely different approach. You seek to understand, and help to grasp the previously untouchable. It's also a much slower process, and depending on the character and the emotion might take years, even a lifetime to fully develop. But it also causes less irrational conflict then just being told what to do or what to feel.