The phrase "suffering ennobles" implies that enduring hardships and difficulties can bring about positive changes in a person's character. Some synonyms for this phrase could include "adversity inspires growth," "pain builds resilience," or "struggle fosters strength." These phrases all suggest that facing challenges can ultimately result in personal development and self-improvement. It's important to note, however, that this idea is not universally held, and some may argue that suffering does not necessarily lead to positive outcomes. Nonetheless, for those who believe in the power of perseverance and growth through hardship, phrases like these can serve as sources of comfort and motivation.