Learn English – What does this archaic use of “fear never but you” mean exactly

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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.

Best Answer

Some editions of this essay add the word that, making it easier to parse:

Fear never but that you shall be consistent in whatever variety of actions. (source)

Fear never is a synonym for never fear or fear not, so a more understandable rendition might be:

Fear not but that you shall be consistent...

But serves to negate, so if we replace it with a different negation word—say, fail—we get:

Do not fear that you will fail to be consistent...

Other usage examples:

  • Time is precious—fear not but that you will be sustained. (source)
  • Sir Michael, fear not but that you have looked your last on me. I go never to cross your path again. (source)