“I did at last overcome the Difficulty; but with so much Paines and Expense of Time as I am not willing to mention; though yet I did not repent of that Labour, when I had discovered thereby, that it was a Businesse, which though with much Difficulty, was yet capable to bee effected.”
An Essay on the Art of Decyphering (1737)
Context: Partly out of my owne Curiosity, partly to satisfy the Gentleman's Importunity that did request it, I resolved to try what I could do in it: And having projected the best Methods I could think of for the effecting it, I found yet so hard a Task, that I did divers Times give it over as desperate: Yet, after some Intermissions, resuming it againe, I did at last overcome the Difficulty; but with so much Paines and Expense of Time as I am not willing to mention; though yet I did not repent of that Labour, when I had discovered thereby, that it was a Businesse, which though with much Difficulty, was yet capable to bee effected.<!--p.13
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John Wallis 34
English mathematician 1616–1703Related quotes

“How did I escape? With difficulty. How did I plan this moment? With pleasure.”
Source: The Count of Monte Cristo
Confessions of a Philosopher (1997)
Context: Speaking for myself, I am not one of those people who are able to deal with the problem by ignoring the questions: it may be a matter of temperament, but for me the apparent unanswerability of the questions sharpens the persistence with which they nag at my mind. Scarcely a day has gone by since my childhood in which I have not thought of them. In fact, the truth is that I have lived my life in thrall to them. They seem to me obviously the most important and interesting questions there are, and in my heart of hearts I do not really understand why not everybody sees them as such. And yet at the end of it all I have no solutions. I am as baffled now by the larger metaphysical questions of my existence as I was when I was a child — indeed more so, because my understanding of the depths and difficulties of the questions themselves is now so much greater.

In his letter to Theo, The Hague, 11 March 1883, http://www.webexhibits.org/vangogh/letter/12/274.htm?qp=art.material,as translated by Johanna van Gogh-Bonger, edited by Robert Harrison, in The Complete Letters of Vincent van Gogh (1991)
1880s, 1883
Context: It constantly remains a source of disappointment to me that my drawings are not yet what I want them to be. The difficulties are indeed numerous and great, and cannot be overcome at once. To make progress is a kind of miner’s work; it doesn’t advance as quickly as one would like, and as others also expect, but as one stands before such a task, the basic necessities are patience and faithfulness. In fact, I do not think much about the difficulties, because if one thought of them too much one would get stunned or disturbed.
A weaver who has to direct and to interweave a great many little threads has no time to philosophize about it, but rather he is so absorbed in his work that he doesn’t think but acts, and he feels how things must go more than he can explain it. Even though neither you nor I, in talking together, would come to any definite plans, etc., perhaps we might mutually strengthen that feeling that something is ripening within us. And that is what I should like.

On Edmund Spenser and his famous work, in a letter to Arthur Greeves (7 March 1916), published in The Collected Letters of C.S. Lewis : Family Letters, 1905–1931 (2004) edited by Walter Hooper, p. 170

The Pearl of Orr's Island : A Story of the Coast of Maine (1862).

Source: The Diary of Anaïs Nin, Vol. 1: 1931-1934
Where Is God (2009, Thomas Nelson publishers)

Duhamel, Cours d'Analyse de l'Ecole Polytechnique. Paris, Bachelier. vol i 1841 vol. ii. 1840.
The Differential and Integral Calculus (1836)