Meditation is to find out whether the brain, with all the activities, all its experiences, can be absolutely quiet. Not forced, because the moment you force, there is duality.
The entity that says, 'I would like to have marvelous experiences, therefore I must force my brain to be quiet,' will never do it.
But if you begin to inquire, observe, listen to all the movements of thought, its conditioning, its pursuits, its fears, its pleasures, watch how the brain operates, then you will see that the brain becomes extraordinarily quiet; that quietness is not sleep but is tremendously active and therefore quiet.
A big dynamo that is working perfectly hardly makes a sound; it is only when there is friction that there is noise.
I find this to be a wonderful image of a mind meditating. Often, we think of quiet as being inactive; but here Krishnamurti reminds us that the truly quiet mind is actually filled with activity. The only noise comes from friction.