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Friends who recommend diamond sutra and altar sutra have no basic understanding of the classification of Buddhist sutras. Some Buddhist classics are theoretical, such as the Diamond Sutra, which talks about what is emptiness and what is prajna wisdom. While others instruct the specific steps of meditation. For example, An Yijing and Yin Zhijin Jing. Before the rise of Tiantai Sect, some special Zen scriptures were translated, but they were not systematic. Mahayana Zen and Hinayana Zen are mixed. The wise master of Tiantai Sect system personally testified for Buddhism and Samadhi in China, and made a systematic arrangement and classification of Indian Zen Buddhism. Moreover, Tiantai Sect's Zen method claims to be a combination of wisdom and beauty without looking at double luck. That is to say, it not only avoids the disadvantage that the word Zen master only knows theory but not meditation, but also avoids the disadvantage that some Zen masters with secret certificates "don't prove if they don't" (that is, they say that they have proved but don't prove).
The Zen method of Zen is for people with roots. If there is no such root machine, it is better to start from the basics honestly.
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Ps: The meditation method mentioned in the recommended answer is the work of the wise master of Tiantai Sect, also called Tongmeng Intuition, or Small Intuition, which is the abbreviation of Maha Intuition (Great Intuition).