“Calm in quietude is not real calm. When you can be calm in the midst of activity, this is the true state of nature. Happiness in comfort is not real happiness. When you can be happy in the midst of hardship, then you see the true potential of the mind.” 

-Huanchu Daoren

"So let the mind flow like water. Face life with a calm and quiet mind and everything in life will be calm and quiet." 

-Thich Thien-An

“Don’t seek, don’t search, don’t ask, don’t knock, don’t demand – relax. If you relax, it comes. If you relax, it is there. If you relax, you start vibrating with it.” 

-Osho

"Nothing outside yourself can cause any trouble. You yourself make the waves in your mind. If you leave your mind as it is, it will become calm."
-Shunryu Suzuki