One cannot be a good person without gratitude, and one cannot be a happy person without gratitude. This provides a vital link between goodness and happiness.

Most people, like the Israelites, complain far more often than they express gratitude. People frequently register a complaint with a manufacturer or service provider, but they rarely write a note of thanks for a job well done. We would all do well to consider writing a thank you note each time we write a letter of complaint. Similarly, and more importantly, too many people criticize their spouses more often than they compliment them. That is the road to an unhappy marriage.

Because gratitude is the key to happiness, anything that undermines gratitude must undermine happiness. And nothing undermines gratitude as much as expectations. There is an inverse relationship between expectations and gratitude: The more expectations you have, the less gratitude you will have.

… instead of allowing the enormity of the world’s sufferings to make me unhappy, I have allowed it to increase the depth of my gratitude for the blessed life that I have been allowed to lead. You can look at the amount of suffering in the world and become bitter (this world stinks), cynical (nothing matters, it’s all just a roulette game), or hedonistic (with all this suffering, I’ll rack up all the fun I can) – or you can be grateful for your blessings.

Raise children who are grateful in general, and grateful to be an American in particular, or grateful to be the citizen of any decent country, who don't complain much, who learn to handle losing, and who are guided by values, not feelings. In other words, teach them how to be happy adults.

Gratitude: Only when people remember the good others have done for them will they have gratitude. Unfortunately, however, most people remember the bad people have done to them far longer than the good. Or to put it another way, gratitude takes effort; resentment is effortless.

Human beings tend to much more quickly forget the good others have done for them than the bad others have done to them. That’s human nature.

Remembering—the good others have done, the evil others have done, and one’s moral obligations—is an indispensable aspect of a good and meaningful life.

Happiness is impossible without gratitude.