Wikipedia
Lojong (Tib. བློ་སྦྱོང་,) is a mind training practice in the Tibetan Buddhist tradition based on a set of aphorisms formulated in Tibet in the 12th century by Chekawa Yeshe Dorje. The practice involves refining and purifying one's motivations and attitudes.
The fifty-nine or so slogans that form the root text of the mind training practice are designed as a set of antidotes to undesired mental habits that cause suffering. They contain both methods to expand one's viewpoint towards absolute bodhicitta, such as "Find the consciousness you had before you were born" and "Treat everything you perceive as a dream", and methods for relating to the world in a more constructive way with relative bodhicitta, such as "Be grateful to everyone" and "When everything goes wrong, treat disaster as a way to wake up."
Prominent teachers who have popularized this practice in the West include Pema Chodron, Ken McLeod, Alan Wallace, Chögyam Trungpa, Sogyal Rinpoche, Kelsang Gyatso, Norman Fischer and the 14th Dalai Lama.