 The 64 original notations of the hexagrams in the I Ching can also be read as a meditation on how change occurs , so it assists Taoists with managing yin and yang cycles as Laozi advocated in the Tao Te Ching ( the oldest known version of this text was dated to 400 BC ) . More recently as recorded in the 18th century , the Taoist master Liu <unk> continued to advocate this usage . 
