What in the actual fuck? This is the exact opposite of what is rational: "Relinquish the emotion which rests upon a mistaken belief, and seek to feel fully that emotion which fits the facts. If the iron approaches your face, and you believe it is hot, and it is cool, the Way opposes your fear. If the iron approaches your face, and you believe it is cool, and it is hot, the Way opposes your calm. Evaluate your beliefs first and then arrive at your emotions. Let yourself say: “If the iron is hot, I desire to believe it is hot, and if it is cool, I desire to believe it is cool.” Beware lest you become attached to beliefs you may not want."
Emotions are generally considered instinctive, not deliberated. You could argue that anything instinctive should be thrown out until you have a chance to verify that it serves a purpose, but brains are not usually that cooperative. Knowing you have an emotion which you do not want (I get angry when people prove that I am wrong about something which I have invested a lot of time thinking about), and being able to destroy it are two different things. If you are able to act in accordance to your best plan instead of following instincts at all times, and run error correction routines to control the damage of an unwanted emotion on your beliefs you are doing something rational.
Here's the new thread for posting quotes, with the usual rules: