In the 6th century BCE, Taoist teacher Lao Tzu espoused a series of naturalistic concepts with some elements of humanistic philosophy. The Silver Rule of Confucianism from Analects XV.24, is an example of ethical philosophy based on human values rather than the supernatural. Humanistic thought is also contained in other Confucian classics, e.g., as recorded in Zuo Zhuan, Ji Liang says, "People is the zhu (master, lord, dominance, owner or origin) of gods. So, to sage kings, people first, gods second"; Neishi Guo says, "Gods, clever, righteous and wholehearted, comply with human." Taoist and Confucian secularism contain elements of moral thought devoid of religious authority or deism however they only partly resembled our modern concept of secularism.

When were humanism beliefs mixed with another philosophy by a Taoist thinker?