The phrase "mends ways" implies a change in behavior or attitude. There are several synonyms for this phrase that can be used to convey a similar meaning, including "turning over a new leaf," "reforming," "changing one's tune," and "seeing the light." Other possible synonyms include "improving one's behavior," "self-improvement," "self-growth," and "personal transformation." Each of these synonyms conveys the idea of positive change and growth, and can be used to describe a wide range of personal or societal changes, from small personal improvements to large-scale political reforms or cultural transformations.