The Greek word "σάρξ" (sarx) primarily refers to "flesh," meaning the soft substance of the body or the physical material of living beings. It can describe the human body as a whole, distinguish the physical from the immaterial aspects of a person, or highlight human mortality and earthly existence. In some contexts, it is associated with physical desires or impulses, and in ethical discussions, especially in Paul's writings, it often represents the part of human nature prone to sinful tendencies.