Source: Mathematical Thought from Ancient to Modern Times (1972), p. 192.
“The Hindus saw clearly that if the arithmetic operations… were properly defined for negative numbers, these numbers could be employed to as good advantage as people had previously derived from positive numbers. …To people to whom the word number had always meant positive whole numbers and positive fractions, the very idea that there could be other numbers came hard. For many centuries negative numbers were either rejected or treated as second-class citizens.
What was especially difficult for mathematicians to swallow was that negative numbers could be acceptable roots of equations.”
Source: Mathematics and the Physical World (1959), p. 51.
Help us to complete the source, original and additional information
Morris Kline 42
American mathematician 1908–1992Related quotes
Source: Mathematical Thought from Ancient to Modern Times (1972), pp. 252-253.
However, negative numbers gained acceptance slowly.
Source: Mathematical Thought from Ancient to Modern Times (1972), p. 185.
Source: Mathematics and the Physical World (1959), pp. 49-50.

Source: The Number-System of Algebra, (1890), p. 86; Reported in Moritz (1914, 282)

“In strong families, positive strokes out-number negative broadsides by a wide margin.”
10 Keys to a Strong Family (2002)
Context: In strong families, positive strokes out-number negative broadsides by a wide margin. Members regularly express appreciation: "Thanks for fixing the drainpipe." "You look so nice in that dress." "The dinner was great." Criticism is offered gently. After all, strong families figure, if we can be kind to strangers, why not to one another?
Source: Mathematical Thought from Ancient to Modern Times (1972), p. 252.
Source: Mathematical Thought from Ancient to Modern Times (1972), p. 592.

Regarding coronavirus. Posed question: "Mr. President, have you been briefed that up to 100 million Americans would ultimately be exposed to the virus?"
Briefing at the White House https://www.whitehouse.gov/briefings-statements/remarks-president-trump-meeting-republican-senators-2/ ()
2020s, 2020, March