What does it mean that the empathy boundary?

You can feel compassion for someone without letting their pain destabilize you.

Example: A parent watches their child sob after being excluded from a birthday party. Every instinct screams to absorb the child's pain — to feel it for them, to hurt because they hurt, to match their anguish as proof of love. But absorbing the pain does not reduce it. It creates two people in pain instead of one, and now the parent is too destabilized to do the only thing the child actually needs: steady presence, warm reassurance, and help processing what happened. The parent who sets an empathy boundary — who understands the child's devastation without being devastated themselves — can hold the child, ask the right questions, and model emotional resilience. The parent who absorbs the child's pain becomes another person who needs comforting, and the child ends up managing the parent's distress on top of their own.

Try this: Choose an upcoming interaction where you expect to encounter someone else's emotional pain — a friend going through a difficult time, a colleague under pressure, a family member in distress. Before the interaction, practice the adapted RAIN sequence internally: set the intention to Recognize their pain clearly, Allow it to be real without absorbing it, Investigate it cognitively by understanding its causes and contours, and Non-identify by reminding yourself that this is their experience unfolding in their life. During the interaction, monitor your internal state. Notice the difference between warmth toward the person and distress inside yourself. After the interaction, write three sentences: what the other person seemed to feel, what you felt, and whether you maintained the boundary between the two. Most people discover on their first deliberate attempt that the other person felt more supported, not less, by a companion who remained stable.