It is used to explain "ziran" (自然), or harmony with the "Tao". It says all ambition originates from the same source. Laozi used the term to mean simplicity and humility as key virtues, in contrast to selfishness. Politically, it means avoiding war, harsh laws and heavy taxes. Some Taoists see a connection between "wu wei" and esoteric practices, such as "zuowang" (坐忘, "sitting in oblivion", emptying the mind of thought) found in the Zhuangzi.