It is just like a bird which came and flew away, and you only heard the flutter of its wings. But those who wish to catch this bird, who wish to see where this bird goes, and when it comes and when it goes, look out for it and sit waiting and watching for the moment when it comes; and that watching is called meditation. Meditation does not mean closing the eyes and sitting; anyone can close his eyes and sit, but he may sit for hours, or he may sit all his life, and still not know what came and what went. It is looking out for what comes, and not only looking out for it, but preparing oneself by making one's senses keen, by making one's body and mind a receptacle for the vibrations, so that when the bird makes a vibration one feels that it has come.