respect

This advice rings true for everyone... show respect. The old proverb (is it a proverb?) 'do unto others as you would have done to yourself' is a great way to live. How we treat people can easily be affected by the situation we are in. Remember, it's no one's fault for the difficulties we face, so when you feel frustrated, don't take it out on someone just because they are there, particularly if they are a friend. Use the 'inner voice' to yell :).