Lesson 27, reason 477: Feelings of peace and contentment are not guaranteed; they must be cultivated. (This requires viewing difficult times with equal measures calmness and fortitude, and viewing pleasant times with equal measures humility and gratitude*. (No portion of this recipe for success may be omitted.))
Lesson 28, reason 478: Every moment of every day is a chance to start again.
Lesson 29, reason 479: Happiness is within your grasp. (You can find it "by reframing your expectations and embracing an imperfect life. You can be happy without being perfect." (My thanks to Alice Domar and Alice Lesch, whose brilliant book, Be Happy Without Being Perfect, has been teaching me how to do just that.))
*I think it's instructive to review these terms here, as it sheds light on why they are so necessary and important.
Calmness: the mental state of being free from agitation, excitement, or disturbance.
Fortitude: strength of mind that enables a person to encounter danger or bear pain or adversity with courage.
Humility: the quality of being modest and respectful.
Gratitude: a feeling of thankfulness or appreciation, as for gifts or favors.