Source: Mathematics and the Physical World (1959), p. 52.
“The chief innovator of symbolism in algebra was François Viète… an amateur in the sense that his professional life was devoted to the law… John Wallis… says that Viète, in denoting a class of numbers by a letter, followed the custom of lawyers who discussed legal cases by using arbitrary names [for the litigants]… and later the abbreviations… and still more briefly A, B, and C. Actually, letters had been used occasionally by the Greek Diophantus and by the Hindus. However, in these cases letters were confined to designating a fixed unknown number, powers of that number, and some operations. Viète recognized that a more extensive use of letters, and, in particular, the use of letters to denote classes of numbers, would permit the development of a new kind of mathematics; this he called logistica speciosa in distinction from logistica numerosa.”
...the growth of symbolism was slow. Even simple ideas take hold slowly. Only in the last few centuries has the use of symbolism become widespread and effective.
Source: Mathematics and the Physical World (1959), p. 60
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Morris Kline 42
American mathematician 1908–1992Related quotes

Jöns Jacob Berzelius, Essay on the Cause of Chemical Proportions, and on some circumstances relating to them: together with a short and easy method of expressing them', Annals of Philosophy, 1814, 3,51-2.

“Why are our days numbered and not, say, lettered?”
Source MP3 2001 in Review: The Winners http://web.archive.org/web/20031217130143/www.mp3newswire.net/stories/2001/2001winners.html - 12/31/2001
Source - The phrase "Innovation Followed by Litigation" was coined in the May 2001 MP3 Newswire article MusicNet and Duet: downloads expire after 30 days http://web.archive.org/web/20031217142150/www.mp3newswire.net/stories/2001/expire.html
Quotes from the MP3 Newswire

“I looked into his eyes and saw three letters: a 'K', a 'G', and a 'B.”
On Vladimir Putin
2000s, 2008

“Moments later he punched her unconscious. [Pause] No, he didn't, don't send us letters”
Concluding an item in which a reporter asked random people on the street if throwing buckets of water at people was offensive, and whether he could do so[citation needed]
From PM and Broadcasting House

2 Corinthians 3:1-16 https://www.biblegateway.com/passage/?search=2+Corinthians+3&version=KJV;SBLGNT
Second Epistle to the Corinthians
Context: Do we begin again to commend ourselves? or need we, as some others, epistles of commendation to you, or letters of commendation from you?
Ye are our epistle written in our hearts, known and read of all men: Forasmuch as ye are manifestly declared to be the epistle of Christ ministered by us, written not with ink, but with the Spirit of the living God; not in tables of stone, but in fleshy tables of the heart. And such trust have we through Christ to God-ward: Not that we are sufficient of ourselves to think any thing as of ourselves; but our sufficiency is of God; Who also hath made us able ministers of the new testament; not of the letter, but of the spirit: for the letter killeth, but the spirit giveth life.
But if the ministration of death, written and engraven in stones, was glorious, so that the children of Israel could not stedfastly behold the face of Moses for the glory of his countenance; which glory was to be done away: How shall not the ministration of the spirit be rather glorious?
For if the ministration of condemnation be glory, much more doth the ministration of righteousness exceed in glory. For even that which was made glorious had no glory in this respect, by reason of the glory that excelleth. For if that which is done away was glorious, much more that which remaineth is glorious.
Seeing then that we have such hope, we use great plainness of speech: And not as Moses, which put a veil over his face, that the children of Israel could not stedfastly look to the end of that which is abolished: But their minds were blinded: for until this day remaineth the same vail untaken away in the reading of the old testament; which vail is done away in Christ. But even unto this day, when Moses is read, the vail is upon their heart. Nevertheless when it shall turn to the Lord, the vail shall be taken away.