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Master Hongyi Li Shutong devoted himself to Buddhist practice and writing books in his later years. He has a profound grasp and understanding of Buddhism. In many works, he explains to people the causes of pain and troubles in daily life, and inspires people to eliminate karma, understand their mind and nature, and live happily. This book collects some of Li Shutong's simple and thought-provoking letters, speeches, and aphorisms, including the true wisdom of how to behave in the world and some questions of Buddhists about Buddhism. This is the essence of Li Shutong's Zen, which can guide ordinary people to cultivate their moral conduct and regulate their souls.