> It subtly hints at the limitations of language in capturing true understanding
and that's still one interpretation ^_^
> Almost every other ancient text starts of being full of certainty
I can't say for sure about ancient texts, but famous wise men certainly (always?) encouraged a fair amount of humility (e.g. Shakyamuni, Socrates, Jesus, Confucius). But few actually wrote.
however, in general, their followers − and popular interpretations − embarrass themselves much less with humility.
in case this isn't known to you − I find this delightful − note that the (respectful) "子" suffix used in names (e.g. Lao-tseu is 老子, Confucius is 孔夫子) means "small thing", "seed", "child".
This is something I was impressed with. Almost every other ancient text starts of being full of certainty or being the authoratitve truth.