What does “making good men better” mean?

Making good men better is a distillation of the purpose of the Masonic experience. The ritual and ceremony serve to convey these tenants and teach certain moral lessons and elevate the individual response to a position higher than themselves. The lessons are things you have likely already heard or have learned in church or moral society. What makes them unique to Freemasonry is that they are presented in a specific format and context.