Letter 109 — On the Fellowship of Wise Men (§9)

“My answer to this is, that when one is heated to the highest degree, one must have continued heat to maintain the highest temperature. And if it be objected that heat is self-maintaining, I say that there are great distinctions among the things that you are comparing; for heat is a single thing, but helpfulness is of many kinds. Again, heat is not helped by the addition of further heat, in order to be hot; but the wise man cannot maintain his mental standard without intercourse with friends of his own kind—with whom he may share his goodness.”