Sometimes all I can do is lay in my bed on back in whatever contorted position I land in there, close my eyes, and say the serenity prayer,
"God, grant me the serenity,"
I usually only get that far before I get lost in breathing, and just existing. That is one of the easiest ways I find peace, and I didn't even realize how often I go to this. I don't even usually get to the rest; the things I can and cannot change, - I just exist, and breathe. It feels beautiful.
For as passionate and intense I can be about things, those simple words as a simple, concise request have kept me level at some of the times when I really needed it. Even if it were only as a breather before jumping back in. A moment of true serenity is refreshing.