Technique II: Loneliness
In the sitting practice of meditation, nobody is going to help you; you are on your own. Be alone, be lonely. Loneliness has the quality of somebody playing a bamboo flute; it has the quality of somebody strumming a guitar at the foot of a waterfall. Occasionally you sneeze, which might shock you. Loneliness will make you resentful and horny. Loneliness will make you cry and laugh at the same time.
From “Following the Example of the Buddha” in The Profound Treasury of the Ocean of Dharma, Volume One, by Chögyam Trungpa, page 181