Chinese philosophy's most famous book opens by saying it can't actually tell you anything

The Tao Te Ching's opening line, 'the Dao that can be spoken is not the eternal Dao,' insists the ultimate nature of reality slips through language itself, so any definition you're given has already missed it. Legend credits the whole text to Laozi, a sage said to have written it down only when begged to at a border gate he was leaving forever.

— Laozi (traditional attribution), Tao Te Ching — c. 4th century BC