To the uninitiated or those who are not familiar to Buddhism, they asked what do we mean when we said that Lati Rinpoche was in "clear light meditation" even though he has physically passed away on Monday 12 April 2010. Rinpoche’s body has retained its heat when he was in a meditative state, which in Tibetan is known as "thugdham". He was only out of thugdham on Wednesday 14 April, after about 56 hours.
Lati Rinpoche, like many great enlightened masters, passed away sitting in the lotus posture. Thugdham is a stage in which a highly learned lama or practitioner is able to meditate on the ‘Clear Light Stage’, an ultimate process of transferring his consciousness / enlightened intention to another realm. Lati Rinpoche, a high practitioner, while in thugdham, was able to control his body from decomposition and to maintain the internal body heat. For a Realized master, this is the time of Nirvana: their entrance into the complete state of Enlightenment. During this time, realized masters are still powerfully connected with all his students. Usually the first 3 days, it is advisable not to touch the body. During this time, the lama went through the outer signs of dying including the cessation of both his breath and the beating of his heart, but remained in that meditative posture for 56 hours, in Rinpoche's case.
For the mind’s nature is clear light.