The three basic principles of CBT:

1. Negative feelings, like depression, anxiety, and anger, do not result from what happens to us, but rather from our thoughts about what’s happening. In fact, our thoughts, or “cognitions,” create all of our emotions, positive and negative.
2. When you’re depressed or anxious, the negative thoughts that trigger your distress, like "I’m no good," or "Things will never change," are distorted or illogical. In fact, depression is the world’s oldest con.
3. When you change the way you THINK, you can change the way you feel.