Expectations are planned resentments

In principle, when we have expectations of others that don’t pan out it often leads to resentment which often brews discontent which often causes conflict. I have heard someone say that expectations are planned resentments.
The surest way to avoid resentment is to not have expectations. When I fall into a victim role it’s helpful to remember that I am rarely a victim of others and often I am a victim of my own expectations.
Practical Tip: As a participant in group decisions, I try hard not to develop false expectations. I expect from people only what they have specifically agreed to, and even then I keep in mind that most people are not capable of doing all that they agree to.
I focus on the good things that my group and the people in it have done, and what they could do, rather than what they should do according to my expectations.