What do you understand by even heartedness in relationships? Calm heart, seek to understand, thank you

Make the mood calm; calm attitude, that is, a way to manage their emotions, in the relationship will inevitably have a variety of differences, disagreements and disputes, and generally disputes will bring the emotions, and the emotions are often easy to stimulate each other, so if both sides are not calm, can not be calm, then the differences and contradictions will be enlarged, the calm heart is a kind of attitude in dealing with the world, is a way to manage the emotions.