This quote is often attributed to Dr. Bernard Baruch, though its exact origin remains uncertain. It captures a powerful philosophy of authenticity and emotional honesty: the people who truly care for you will accept you as you are, while those who criticize or reject you are not worth your concern. The chiasmic structure — reversing "mind" and "matter" — gives the saying a memorable, almost proverbial quality. It continues to resonate widely because it offers a liberating permission to stop seeking approval from everyone and instead prioritize the few relationships that genuinely matter.