Copy from Google...
1. Never both be angry at the same time.
2. Never yell at each other unless the house is on fire.
3. If one of you has to win an argument, let it be your mate.
4. If you have to criticize, do it lovingly.
5. Never bring up mistakes of the past.
6. Neglect the whole world rather than each other.
7. Never go to sleep with an argument unsettled.
8. It takes two to quarrel and the one in the wrong is the one who does the most talking. Less talk less problems