《文昌孝经·孝感章》
天聋和地哑，并不是真的聋，也不是真的哑，是特别为了使天地的秘密，不尽被人所解知。
天聋与地哑，非聋亦非哑。
Tianlong and Diya are not really deaf or dumb, they are specially designed to prevent the secrets of heaven and earth from being fully understood by people.