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The value of a tree is shown by its fruit.
Literal
Tree [possessive-の] value [topic-は] its fruit [by-で] is-understood.
A version of the same proverbial wisdom but with the abstract noun 価値 ('value, worth') as the topic instead of the tree itself. The idea remains that a thing is judged by its output — an ethical-proverbial flavour, slightly philosophised.