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Related to surely: Slowly but Surely

slowly but surely

At a slow or incremental pace but making steady, dependable progress. I've been writing my thesis slowly but surely—it will probably take me all year to finish it, but it's getting there! A: "Hey, how's the new novel coming along?" B: "Ah, slowly but surely!
See also: but, slowly, surely

slow but sure

 and slowly but surely
slow but unstoppable. Bob's progress on his novel was slow but sure. Nancy is finishing the paint job on her house, slowly but surely.
See also: but, slow, sure

slow but sure

Gradual or plodding but certain to finish, as in Slow but sure this book's getting written. This idiom was first recorded in 1562, although the idea is much older. A related phrase appears in the proverb slow and steady wins the race, which is the moral of Aesop's fable about the race between a tortoise and a hare, which stopped to nap during the race and therefore lost.
See also: but, slow, sure
References in classic literature ?
give me each a little light from your own breasts, and surely they will glow the brighter for this kindly deed; and I will thankfully repay it if I can.
And Ripple said she would consent, though she knew not if the jewels could be found; still, thinking of the promise she had made, she forgot all else, and told the Spirits what they asked most surely should be done.
Surely Priam with his sons would rejoice, and the Trojans be glad at heart if they could hear this quarrel between you two, who are so excellent in fight and counsel.
He raised his hands in prayer to his immortal mother, "Mother," he cried, "you bore me doomed to live but for a little season; surely Jove, who thunders from Olympus, might have made that little glorious.
Incline your head," said she, "and promise me surely, or else deny me--for you have nothing to fear--that I may learn how greatly you disdain me.
It affords me great pleasure to surprise people; for surely I cannot be classed with ordinary insects and am entitled to both curiosity and admiration from those I meet.
Yes, there was a fellow driving off from a tee, and that other group upon the green were surely putting for the hole.
Surely you have learned something from what we have undergone.
Surely such persons, if they will not be thought mad, must own, either that they are incapable of tasting the sweets of the tenderest friendship, or that they sacrifice the greatest happiness of which they are capable to the vain, uncertain, and senseless laws of vulgar opinion, which owe as well their force as their foundation to folly.
Oh, not the end--surely, surely not the end already!
It will be a longer separation, in the event of their going abroad, than it would be in the event of their remaining in London--but we must set against this disadvantage the benefit to Laura, on the other side, of passing the winter in a mild climate, and more than that, the immense assistance in raising her spirits, and reconciling her to her new existence, which the mere wonder and excitement of travelling for the first time in her life in the most interesting country in the world, must surely afford.
Surely my chance meeting with him on the moor has disclosed another favourable trait in his character?
But if I am spared by lesser men, our day will surely come.
Your native shrewdness, my dear Watson, that innate cunning which is the delight of your friends, would surely prevent you from inclosing cipher and message in the same envelope.
As Terry wrote, with today's technology these could be made more comfortable and surely at a cheaper cost than that of a traditional build.