Meditation is like a single log of wood. Insight and investigation are one end of the log; calm and concentration are the other end. If you lift up the whole log, both sides come up at once. Which is concentration and which is insight? Just this mind.
-Ajahn Chah, “Still Forest Pool”
From “365 Buddha: Daily Meditations,” edited by Jeff Schmidt. Reprinted by arrangement with Tarcher/Putnam, a division of Penguin Putnam Inc.