“The Vegetarians may confidently reckon that the new perfect man will not kill and devour other animals, nay, will not kill and devour vegetables, if it is cruel and wrong to do so. Should he after serious moral reflection conclude that vegetable life is as sacred as animal, he will doubtless be clever enough to derive plenty of wholesome food from the mineral kingdom; and should he deem it wrong to ravage even this for so vulgar a purpose as filling his belly, he will doubtless be able to nourish himself without devouring anything at all.”
"The Speedy Extinction of Evil and Misery", part V, pp. 79–80
Essays and Phantasies (1881)
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James Thomson (B.V.) 26
Scottish writer (1834-1882) 1834–1882Related quotes
Essays on Diet (1883); quoted in Prof. Francis William Newman http://www.ivu.org/history/europe19b/newman.html at the International Vegetarian Union website.

"Go vegetarian, pleads Yana Gupta in new ad" https://www.rediff.com/news/2004/jan/29peta.htm, Rediff.com (29 January 2004).

“When a man is old enough to do wrong he should be old enough to do right also.”
Source: A Woman of No Importance

Third Thesis
Idea for a Universal History from a Cosmopolitan Point of View (1784)