Well it is important to treat people in the way that you want to be treated and by being honest, respectful and responsible with others then hopefully that is how they will be with you. It also a good way for people to know you as, that way they will always want to deal with you.
Character and creditibility (not sure I spelled that right lol). Think about it... If you were the exact opposite of those things listed, how many peaceful and trustworthy relationships would you have in your life? Highly most likely none.
Everyone should exhibit traits that they would admire in others. If you can honestly say at the end of the day that you were the best person u can be, then you'll be happy. It's also important to treat others well, so they'll do the same.
This is human philosophy, common sense, why would you ask this? It's good because it makes you a better person and you won't get into a lot of trouble with the people in your surroundings. Treat others the way you want to be treated.