Being kind should not be that hard. If you find that being kind to others or saying nice things to others is hard then it is time to take a look at yourself.

 Saying you are sorry after saying something cruel is a step in the right direction. But the optimal choice is to have the self control not to say the mean thing that you will regret saying in the first place.

 Be your best self, if you are constantly apologizing for bad behavior, address it at the root.