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In page Tao:

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A central tenet in most varieties of religious Taoism is that the Tao is ever-present, but must be manifested, cultivated, and/or perfected to be realized. It is the source of the Universe, and the seed of its primordial purity resides in all things. Breathing exercises, according to some Taoists, allowed one to absorb "parts of the universe."[6] Incense and certain minerals were seen as representing the greater universe as well, and breathing them in could create similar effects.[citation needed] The manifestation of the Tao is de, which rectifies and invigorates the world with the Tao's radiance.[3]