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You can't see the forest for the trees.
Literal
Tree [object-を] look-[and-て] forest [object-を] look-not.
A classic proverb with a parallel 'see X and not see Y' frame, using the literary/archaic negative 見ず (instead of the modern 見ない). ~ず is the classical negative ending, still active in proverbs, set phrases, and formal writing. The combined meaning is that by focusing on individual trees, you miss the larger forest — i.e. you get lost in details and lose the big picture.