(Sanskrit. Tibetan: yongs su mya ngan las 'das) The state of total cessation of all sufferings, disturbing emotions, and their psychological sources. This term is usually used in reference to the passing away of a buddha or practitioner.
"Tremendous is the effort and the vigilance that is needed from second to second, from moment to moment, in order to not fall into illusions. One minute of unawareness is enough for the mind to be already dreaming about something else, distracting it from the job or deed that we are living at the moment."