Morally speaking, we should be concerned for our whole environment.
Don't let a little dispute injure a great relationship.
Neither a space station nor an enlightened mind can be realized in a day.
Remember that sometimes not getting what you want is a wonderful stroke of luck.
Hatred, jealousy, and fear hinder peace of mind. When you're angry or unforgiving, for example, your mental suffering is constant. It is better to forgive than to spoil your peace of mind with ill feelings.
In disagreements with loved ones, deal only with the current situation. Don't bring up the past.