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.
At first, I saw mountains as mountains and rivers as rivers. Then, I saw mountains were not mountains and rivers were not rivers. Finally, I see mountains again as mountains, and rivers again as rivers.