《管子·戒》
其所以叫作有德，就是不必发动，人们也知有所努力；不用言语，人们也能够理解；不自为，事情也能成；不召唤，人们也能到。这就是德的作用。
所以谓德者。不动而疾，不相告而知，不为而成，不召而至，是德也。
The reason that it is called virtue is that there is no need to exert oneself, yet people will know to make an effort; that there is no need to speak, yet people can still understand; that there is no need to do anything, yet things can still be accomplished; that there is no need to summon people, yet they will come. This is the function of virtue.