A monk is a man who is a member of a religious order and lives in a monastery. A monk usually lives his life in prayer and contemplation. The concept is ancient and can be seen in many religions and in philosophy across numerous cultures.
A priest is a person authorized to perform the sacred rituals of a religion, especially as a mediatory agent between humans and one or more deities.
Religions
In many religions, including Buddhism, Taoism, Christianity, and ancient Judaism.
In many religions, including Hinduism, Shinto, Taoism, Christianity, and ancient Judaism.
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