"Mahamudra of devotion" in relation to Guru Yoga practice?

Question: Could Rinpoche please explain the “mahamudra of devotion” in relation to Guru Yoga practice? How does one approach this?
Garchen Rinpoche: When you realize that your own mind and the mind of the guru are one, then you have uncontrived devotion. First, we give rise to devotion by thinking of the guru’s qualities, even to the point where tears come to our eyes. However, we do not grasp at this thought, but instead rest in the natural state. Within Mahamudra, our mind, the mind of the guru, and the mind of the Buddha are one.