Look into your own heart, discover what it is that gives you pain and then refuse, under any circumstance whatsoever, to inflict that pain on anybody else.

The line distills a practical, introspective version of the “Golden Rule.” Instead of beginning with abstract moral principles, it asks you to identify—through honest self-examination—the specific experiences that wound you (humiliation, exclusion, betrayal, fear). Ethical behavior then becomes a disciplined refusal to reproduce those injuries in others, even when anger, power, or social permission might make it easy. The emphasis on “under any circumstance whatsoever” frames compassion as a non-negotiable practice rather than a mood. It also implies that cruelty often arises from unrecognized personal pain; naming that pain can interrupt cycles of retaliation and normalize empathy as a deliberate moral choice.