From
《孟子·滕文公下》 (Mencius, Duke Teng Wen II). Mencius' definition of the
大丈夫 (great person):
富贵不能淫,贫贱不能移,威武不能屈 - 'not corrupted by wealth and status, not moved by poverty and humble station, not bent by force and power'. The middle term of the triad - the test of hardship.