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.
The first thing to realize in meditation is that there is no authority, that the mind must be completely free to examine, to observe, to learn. And so there is no following, no accepting, no obedience.
Meditation is not the pursuit of an invisible path leading to some imaginal bliss. The meditative mind is seeing, watching, listening, without the word, without comment, without opinion, attentive to the movement of life in all its relationships throughout the day.
Everything is based on mind, is led by mind, is fashioned by mind. If you speak and act with a polluted mind, suffering will follow you, as the wheels of the oxcart follow the footsteps of the ox. Everything is based on mind, is led by mind, is fashioned by mind. If you speak and act with a pure mind, happiness will follow you, as a shadow clings to a form.
Meditation is like the cloak of the good thief. You find a corner or somewhere where you can actually entertain your own self and your own soul, and understand what your work [is] here.