And if you read the lives of the great workers which the world has produced, you will find that they were wonderfully calm men. Nothing, as it were, could throw them off their balance. That is why the man who becomes angry never does a great amount of work, and the man whom nothing can make angry accomplishes so much. The man who gives way to anger, or hatred, or any other passion, cannot work; he only breaks himself to pieces, and does nothing practical. It is the calm, forgiving, equable, well-balanced mind that does the greatest amount of work.
- Swami Vivekananda
The Complete Works of Swami Vivekananda/Volume 2/Practical Vedanta and other lectures/Practical Vedanta: Part I (Delivered in London, 10th November 1896)