Chapter 16 compares two kinds of qualities. Good qualities, like fearlessness, honesty, kindness and patience, lead to freedom. Harmful ones, like pride, anger and cruelty, lead to suffering.

Then Krishna gives a short warning that is easy to remember. There are three doors that lead into trouble: lust, anger and greed.

Lust here means strong, selfish wanting, wanting something so much that you'd hurt someone to get it. Anger is the hot feeling that makes us say and do things we later regret. Greed is never having enough, always wanting more, more, more.

Most of the trouble in the world, from fights between friends to wars between countries, starts at one of these three doors.

Krishna doesn't say we'll never feel these things. Everyone does. He says to notice when we are standing at one of these doors, and choose not to walk through.

A simple trick: when you feel anger rising, take three slow breaths before you speak. When you feel greed, think of one thing you already have and are thankful for.