"Don't be a dick."
Anybody can be nice when they feel like it, and just as easily be a dick when they feel like it. Even beasts do this.
Practice a discipline of kindness, ESPECIALLY when you're not up to it, and you'll find it's a lot easier to resist being cold-hearted when experiencing some moodiness. The reason why: you're getting used to having feelings, instead of feelings having their way with you.
Chasing highs over lows (manic-dep.) or killing-off your sensitivity (psychopathy) is an immature response to your emotions. However common that immaturity may seem, both ways are tense, and seeped in distrust, anxiety, and fear; both are downward spirals, opposed to reality... both untenable.
"Don't be a dick." Good advice.
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