There are four classic texts of Taoism: The Lao-tzu (AKA The Tao Te Ching), The Chuang-tzu, The Wen-tzu, and the Lieh-tzu. These were all put together between 500 BCE and 400 CE. Somewhere within that period, the following was attributed to Lieh-tzu: "The sage Wen-tzu said, 'Someone who knows how to withdraw when his work is finished is one who understands the way of heaven. He has no quarrel with the world, and whatever he does follows the natural order of things. 'Therefore, the enlightened person does not need eyes to see the Way. This is because the Way cannot be grasped with your senses and thoughts. 'Look for it in front and it will sneak behind you. Seek it with good intentions and it is everywhere. 'If you are insincere, it will never reveal itself. 'Is something that you cannot use your intellect to attain, and if you are not serious, it will also escape you. 'Only in naturalness can the Way be attained. 'And after you have attained it, only in naturalness can it be kept. 'Knowing the truth of things and yet not clutching to the truth, knowing how to act and not using effort to do it, is the mark of a sage. 'If you pretend to know or not to know, pretend to do or not to do, you are just like a pile of dirt. It sits there doing nothing. And it is also worth nothing.'" (Quoted from "The Lieh-Tzu" by Eva Wong). From 400 BCE.