This is so very true. It never ceases to amaze me how it never seems to occur to those people who speak poorly of others behind their backs all the time -- how much they are actually speaking of themselves with their actions. Speaks volumes to me of their own character.
Don't be fooled between character and an act. A person who is truly good-hearted will be kind to everyone, not just the people they stand to gain something from. A person who is truly kind will feel remorse for causing pain, and they will try to make it right.