fight the good fight
To act in a way that is virtuous or honorable. They've been fighting the good fight for positive change in the company's sexist culture.
fight the good fight
to fight a noble and well-intentioned battle. He fought the good fight and left the meeting with a clear conscience.
fight the good fight
do your best always to live up to the tenets of your religion, especially Christianity. The expression originated in the Bible: ‘Fight the good fight of faith, lay hold on eternal life’ (1 Timothy 6:12).