“The charge of "sentimentalism" is frequently brought against those who plead for animals' rights. Now "sentimentalism," if any meaning at all can be attached to the word, must signify an inequality, an ill balance of sentiment, an inconsistency which leads men into attacking one abuse, while they ignore or condone another where a reform is equally desirable. That this weakness is often observable among "philanthropists" on the one hand, and "friends of animals" on the other, and most of all among those acute "men of the world," whose regard is only for themselves, I am not concerned to deny; what I wish to point out is, that the only real safeguard against sentimentality is to take up a consistent position towards the rights of men and of the lower animals alike, and to cultivate a broad sense of universal justice (not "mercy") for all living things. Herein, and herein alone, is to be sought the true sanity of temperament.”
Source: Animals' Rights, Chapter 1
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Henry Stephens Salt 19
British activist 1851–1939Related quotes

“You are like all cruel men, sentimental; you are like all sentimental men; squeamish.”
“Poor Little Warrior!” p. 80
Short fiction, Who Can Replace a Man? (1965)

Source: Speech (June 1853), p. 79

1870s, Oratory in Memory of Abraham Lincoln (1876)

Letter to Edward Newenham (20 October 1792) http://etext.lib.virginia.edu/etcbin/toccer-new2?id=WasFi32.xml&images=images/modeng&data=/texts/english/modeng/parsed&tag=public&part=155&division=div1, these statements and one from a previous letter to Newenham seem to have become combined and altered into a misquotation of Washington's original statements to read:
1790s
Context: Of all the animosities which have existed among mankind, those which are caused by difference of sentiments in religion appear to be the most inveterate and distressing, and ought most to be deprecated. I was in hopes that the enlightened and liberal policy, which has marked the present age, would at least have reconciled Christians of every denomination so far that we should never again see the religious disputes carried to such a pitch as to endanger the peace of society.

“Sentimentality is the emotional promiscuity of those who have no sentiment.”
Review of the book My Hope for America (1964) by Lyndon B. Johnson
Cannibals and Christians (1966)

Sect. 1
1900s, Hind Swaraj (1908)

RODIN, AUGUSTE. L'Art. Entretiens réunis par Paul Gsell, 1911

“My father was a deeply sentimental man. And like all sentimental men, he was also very cruel.”