"I have said this to explain the stanza that follows, in which the soul replies to those who call in question its holy tranquillity, who will have it wholly occupied with outward duties, that its light may shine before the world: these persons have no conception of the fibres and the unseen root whence the sap is drawn, and which nourish the fruit."

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Each new ontological theory, propounded in lieu of previous ones shown to be untenable, has been followed by a new criticism leading to a new scepticism. All possible conceptions have been one by one tried and found wanting; and so the entire field of speculation has been gradually exhausted without positive result: the only result reached being the negative one above stated, that the reality existing behind all appearances is, and must ever be, unknown.

— Herbert Spencer