一切經音義 25.146

25.146

Like a tortoise concealing its six limbs (A tortoise has a head, tail, and four legs, which are called its six places; if harassed, it withdraws them into its shell. Sentient beings' six sense faculties run toward external objects; when the sense-thieves come to attack, they guard their own faculty-gates, just as a tortoise conceals its six limbs).