the world becomes a lot easier to love when you go through it with the belief that everyone is usually doing their best, and is probably frustrated with their own shortcomings even more than you might be frustrated with them.
when someone disappoints or angers you, remember:
It is probably the case that, somewhere in the past, you did something that made you more happy/productive/fulfilled, but you don’t do it anymore, for no good reason. Think about that, and do it again, preferably instead of one of your less desirable behaviors.