The case for trade is not just monetary, but moral. Economic freedom creates habits of liberty. And habits of liberty create expectations of democracy.
I never had one hour's happiness in her society, and yet my mind all round the four-and-twenty hours was harping on the happiness of having her with me unto death.
We changed again, and yet again, and it was now too late and too far to go back, and I went on. And the mists had all solemnly risen now, and the world lay spread before me.
The fourth (of the four cardinal virtues) is supportiveness: this manifests as service to others without expectation of reward. (Paraphrased: Such service is not a mere conforming to some external rule of behavior, but instead a manifestation of your original nature).
Although we deal with probabilities and expectations, the actual results can deviate substantially from such expectations, particularly on a short-term basis.
We fight for lost causes because we know that our defeat and dismay may be the preface to our successors' victory, though that victory itself will be temporary; we fight rather to keep something alive than in the expectation that anything will triumph.
You cannot live with expectations because life has no obligation to fulfill your desires. You can live with an open heart, but you cannot live with expectations. The more expectations you have, the more frustrated you will be.
Other people are not here to fulfill our needs or meet our expectations, nor will they always treat us well. Failure to accept this will generate feelings of anger and resentment. Peace of mind comes with taking people as they are and emphasizing the positive.