During the financial crisis, I worked with hundreds of executives who struggled as a result of their thoughts about job security. When their beliefs changed, so did their emotional experience - and they were then able to focus on the task at hand more effectively.

We need to distinguish between stress and stimulation. Having deadlines, setting goals, and pushing yourself to perform at capacity are stimulating. Stress is when you're anxious, upset, or frustrated, which dramatically reduce your ability to perform.

A hero has faced it all: he need not be undefeated, but he must be undaunted.

The more you worry, the more you throw off the delicate balance of hormones required for health.

The reason humans experience so much more stress than other species isn't just because we think more, but also because we think differently.

The less you think counterfactually, the less you experience stress. Stress, in this light, isn't a bad thing. It's simply a warning system telling you that your mind has lost touch with what's real.

Even in this secular country, the threat posed by religious fundamentalists is never very far away. Every major religious text exhorts the same principles - that of unyielding obedience to a supernatural being, and renunciation of the intellect and personal aspirations.