In general though there are many profound and important dharmas, the Guru yoga and the intimate instructions of this are more profound.
Loppon Rinpoche said:
This alone is the extracted essence of all my Dharma cycles. Since that great Guru did not propagate this intimate instruction, he did not allow me to. It is very important that you emphasize this, practice it secretly, and you will obtain the supreme siddhi of mahāmudrā in this life, and also there is no doubt that whatever ordinary things you wish can be accomplished with the intimate instructions.
