“The force of custom or habits even proverbial; and accordingly we take advantage of the magnified representation in which we have been pleased to paint its effects, to veil our eyes from the sufferings of others, of mankind as well as of brutes; and whatever be their lots, if they suffer from over exertion, from being flogged, from exposure in danger, from want, from cold, from heat, etc., we lull our imagination with the idea that they do not feel those evils: custom we say is second nature.”
Source: Moral Inquiries on the Situation of Man and of Brutes (1824), Chapter 2, p. 53
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Lewis Gompertz 9
Early animal rights activist 1783–1861Related quotes

“The laws of conscience, which we pretend to be derived from nature, proceed from custom.”
Book I, Ch. 22. Of Custom
Essais (1595), Bartlett's Familiar Quotations, 10th ed. (1919)

“We suffer primarily not from our vices or our weaknesses, but from our illusions.”
Preface
The Image: A Guide to Pseudo-Events in America (1961)
Context: We suffer primarily not from our vices or our weaknesses, but from our illusions. We are haunted, not by reality, but by those images we have put in their place.

“We learn a lot from the mistakes of others, but even more from our own.”
Examples of self-translation (c. 2004), Quotes - Zitate - Citations - Citazioni

“Just as we suffer from excess in all things, so we suffer from excess in literature; thus we learn our lessons, not for life, but for the lecture room.”
Quemadmodum omnium rerum, sic litterarum quoque intemperantia laboramus: non vitae sed scholae discimus.
Alternate translation: Not for life, but for school do we learn. (translator unknown)
Alternate translation: We are taught for the schoolroom, not for life. (translator unknown).
Source: Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter CVI: On the corporeality of virtue, Line 12

Those ill-bred people, who expect their acquaintance to love and caress them, with all their foibles, are as absurd as a poor ragged cinder-wench; who should roll about upon an heap of ashes, scrabbling and throwing dust in the face of every one that passed by; and yet flatter herself that she should allure some youth to her embraces, by these dirty endearments; which would infallibly keep him at a distance.
Source: Galateo: Or, A Treatise on Politeness and Delicacy of Manners, p. 15
“If you did not suffer from emotions, from feelings, you could be as powerful as we are.”
David Zellaby (Martin Stephens), Village of the Damned, (speaking to his father) (1960)