Christian author Brennan Manning calls us to examine the cause of our emotions:

To ascertain where you really are with the Lord, recall what saddened you the past month. Was it the realization that you do not love Jesus enough? That you did not seek his face in prayer often enough? That you did not care for his people enough? Or did you get depressed over a lack of respect, criticism from an authority figure, your finances, a lack of friends, fears about the future, or your bulging waistline?

Conversely, what gladdened you the past month? Reflection on your election to the Christian community? The joy of saying slowly, "Abba, Father"? The afternoon you stole away for two hours with only the gospel as your companion? A small victory over selfishness? Or were the sources of your joy a new car, a Brooks Brothers suit, a great date, great sex, a raise, or a loss of four inches from your waistline?