From
孟子·滕文公下 (Mencius, Duke Teng Wen II). Mencius' definition of the true
大丈夫 (great person):
富贵不能淫,贫贱不能移,威武不能屈 - '(One who is) not corrupted by wealth and status, not moved by poverty and humble station, not bent by force and power'. The three clauses are almost always quoted together.