"The Buddha discovered that the happiest mind is the nonattached one. This happiness is of a radically different order than what we're used to. When asked how there could be bliss in nibbana, since it offers no lovely sights or sounds, Sariputta, the Buddha's chief disciple, said: "That there is no sensation is itself happiness." Compared with this joy, he implied, pleasure falls woefully short. We read in the sutras that "everything the world holds good, sages see otherwise. What other men call 'sukha' (pleasure) that the saints call 'dukkha' (suffering) . . ." (SN 3.12). This isn't just an alternative viewpoint - it's ultimate reality."

What's so great about now? - Tricycle:  The Buddhist Review - Winter 2006