Mind
“If you gain control over your mind, then even if you are at the point of death, you will understand that it is only because of a particular thought that there is an impression of dying - and that the nature of the mind is utterly beyond both birth and death. It would be excellent if you could gain this confidence.
So keep this little, essential instruction in your heart. Conviction and confidence in this is what we call the Dharma. If you vacillate and think of Dharma as something extraneous to you, thought up by somebody else, you will not benefit from it. Instead, do yourself a favor and get out of samsara.” Dudjom Rinpoche
From the book Counsels from My Heart discourses given by Kyabje Dudjom Rinpoche