In Emerson's famous essay Self-Reliance there's this sentence:
Fear never but you shall be consistent in whatever variety of actions, so they be each honest and natural in their hour.
I guess that this is a rather archaic and/or literary use of the word 'but', and that it's more or less similar to its use in 'It never rains but it pours'. (In which 'but' means 'without it being the case that'.) Is my hunch correct? If so, what does the sentence mean exactly? The combination of the imperative and 'but' makes this sentence difficult to follow.