 They took bonding all the natural kinds together as the key. They said, “tiannature:sky constancies can cover but cannot sustain; Earthly cycles can sustain but cannot cover it. Great daoguide can embrace it but cannot distinguish it.” We know the myriad natural kinds all have both that which is acceptable and that which is unacceptable. So they said, “If you select then you cannot be comprehensive, if you teach you cannot convey all of it. Daoguide does not leave anything out.” 