Mirror of Wisdom with the subtitle ?Teachings on Emptiness? is Geshe Tsultim Gyeltsen commentaries on the emptiness section of ?Mind Training Like the Rays of the Sun? and ?The Heart Sutra?. The subject of emptiness is very profound. Here, Geshe-la gives us clear and extensive instructions on the topic so that we may come to understand and experience its meaning. The realization of the wisdom of emptiness is vital to our spiritual development.