ה֣וֹן עָ֭שִׁיר קִרְיַ֣ת עֻזּ֑וֹ מְחִתַּ֖ת דַּלִּ֣ים רֵישָֽׁם׃
Ibn Ezra on Proverbs
The rich man's wealth is like a fortress that will save him from moments of troubles even though he is not wise; and “the poor” i.e., the heartless, their poverty will ruin them.