“If I have exhausted the justifications, I have reached bedrock and my spade is turned. Then I am inclined to say: "This is simply what I do."”
§ 217
Source: Philosophical Investigations (1953)
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Ludwig Wittgenstein 228
Austrian-British philosopher 1889–1951Related quotes

Attributed by Thomas Babington Macaulay, Life of Frederick the Great (1882), pg 48.
Repeated by Thomas Babington Macaulay in a review of "Frederick the Great and his Times. Edited, with an Introduction, by Thomas Campbell, Esq". Edinburgh Review, ISSN 1751-8482, 04/1842, Volume 75, Issue 151, p. 241-242, though it does not appear in the original work.
Knowles, Oxford Dictionary Of Quotations (5th Edition) (Oxford University Press, 1999)
Attributed
“I don't say so, but my spade tells me so.”
B.B. Lal's reply to his critics (traditional Hindus). As related and quoted in Elst, Koenraad (2012). The argumentative Hindu. New Delhi : Aditya Prakashan. Chapter: Ayodhya’s three history debates.
In the 1970s, Prof. B.B. Lal's excavation campaign “Archaeology of the Ramayana sites” [Lal 2008:15-28] found a common material culture at Ayodhya, Chitrakuta and other Ramayana sites all datable to a common period. It earned him the wrath of an audience of traditional Hindu godmen, who tend to place the Ramayana events at a far greater time-depth.

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Books, The Beggar, Volume I: Meditations and Prayers on the Supreme Lord (Hari-Nama Press, 1994)

On how being a lawyer shaped her writing in “Exclusive interview: Petina Gappah speaks about the highs and lows of her writing career, and reveals details of her next book” https://johannesburgreviewofbooks.com/2017/09/04/exclusive-interview-petina-gappah-speaks-about-the-highs-and-lows-of-her-writing-career-and-reveals-details-of-her-next-book/ in the Johannesburg Review of Books (2017 Sep 4)