Pretty much anything done to excess or to the exclusion of variety can make you angry, bitter and ineffective. What you are doing can also seem strained or excessive to others, making it less effective. Similarly, too much variety can also make you angry, bitter and ineffective.
So it seems we must have some variety and do things with a light touch. Doing things with a light touch is a non-excessive way of doing things. The saying about having a light heart probably gets at the same thing. So, have a light touch.