Neidan, or internal alchemy (simplified Chinese: 內丹术; traditional Chinese: 內丹術; pinyin: nèidān shù), is an array of esoteric doctrines and physical, mental, and spiritual practices that Taoist initiates use to prolong life and create an immortal spiritual body.
The meaning of spirituality has developed and expanded over time, and various connotations can be found alongside each other.
Time is the indefinite continued progress of existence and events that occur in an apparently irreversible succession from the past, through the present, to the future.
Philosophical presentism is the view that neither the future nor the past exist.

(source: wikipedia italiana)
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