Subtlety and zen.

"Entering the forest he moves not the grass;

Entering the water he makes not a ripple." Zenrin Kushû (The Way of Zen 152, 224)

In essence, the zero effect. To interject in a situation yourself, cause no ripples to effect that situation, and help in someway if possible. But its hard. Feelings, opinions are a bitty to keep objective. That is the daily struggle...