Lama Zopa Rinpoche discusses buddha nature in this teaching excerpted from Kopan Course No. 40.

Lama Zopa Rinpoche explained the visualization when doing tonglen (taking and giving) meditation in this excerpt from the 26th Kopan Course.

A teaching on buddha nature and the emptiness of the mind.

In this excerpt from Kopan Course No. 27, Rinpoche explains how the hallucinatory mind sees everything as inherently existent

A Dharma talk explaining the mind, or cognition

A teaching on the mind, the death process and the ultimate nature of the I

The omniscient mind is the continuity of consciousness that is completely purified of all obscurations.