"You cannot quench understanding unless you put out the insights that compose it. But you can rekindle those at will, like glowing coals. I can control my thoughts as necessary; then how can I be troubled? What is outside my mind means nothing to it. Absorb that lesson and your feet stand firm.

You can return to life. Look at things as you did before. And life returns."

- Marcus Aurelius

The power of thoughts. If you can control your thoughts you can control your emotional state and wellbeing. External events don't have to change your frame of reference and internal dialogue. You're thinking can manifest your own prison or nirvana, you choose.