Many people think inner beauty is just a phrase "used for ugly people to make them feel better about themselves." People who think that are sorely mistaken.
Not all people who have inner beauty are "ugly," in fact, many people with inner beauty also have outer beauty. So you can't just look at someone and know if they have inner beauty, you have to get to know them first.
Ever heard the phrase, "It's what's on the inside that counts"? It's true.