From The Course of Love by Alain de Botton:
But calm is precisely what is absent from love’s classroom. There is simply too much on the line. The “student” isn’t merely a passing responsibility; he or she is a lifelong commitment. Failure will ruin existence. No wonder we may be prone to lose control and deliver cack-handed, hasty speeches which bear no faith in the legitimacy or even the nobility of the act of imparting advice.
And no wonder, too, if we end up achieving the very opposite of our goals, because increasing levels of humiliation, anger, and threat have seldom hastened anyone’s development. Few of us ever grow more reasonable or more insightful about our own characters for having had our self-esteem taken down a notch, our pride wounded, and our ego subjected to a succession of pointed insults. We simply grow defensive and brittle in the face of suggestions which sound like mean-minded and senseless assaults on our nature rather than caring attempts to address troublesome aspects of our personality.