Tao Te Ching

Notably the "Ching" here is identical to that in "I Ching". So it's really more of a jīng as in yijing, high tone, meaning "classic book".

"The way you can go isn't the real way. The name you can say isn't the real name." — tao-te-ching 1 as interpreted by Ursula K. Le Guin

Tao Te Ching