坚贞不渝

Explanation: Uphold the moral integrity will never change 　　Usage: Supplemental; as the predicate attribute; with compliment 　　Source: Xu Chi "Peony": "They are indomitable, steadfast, not enough to shake them to any test." Thesaurus:  Iron unyielding, be enduring as the universe, as long as the heaven and earth endure, adamantine, Hao ran Qi, Candour Not A, Jian-Gang unyielding, to give rewards or punishment strictly and impartially Antonym Group:  Let bygones be bygones, Do not chase past