“. . . in no instance has a system in regard to religion been ever established, but for the purpose, as well as with the effect of its being made an instrument of intimidation, corruption, and delusion, for the support of depredation and oppression in the hands of governments.”

“No power of government ought to be employed in the endeavor to establish any system or article of belief on the subject of religion.”

“In the mind of all, fiction, in the logical sense, has been the coin of necessity;—in that of poets of amusement—in that of the priest and the lawyer of mischievous immorality in the shape of mischievous ambition,—and too often both priest and lawyer have framed or made in part this instrument.”

“What other agents then are there, which, at the same time that they are under the influence of man's direction, are susceptible of happiness? They are of two sorts: (1) Other human beings who are styled persons. (2) Other animals, which, on account of their interests having been neglected by the insensibility of the ancient jurists, stand degraded into the class of things... But is there any reason why we should be suffered to torment them? Not any that I can see. Are there any why we should not be suffered to torment them? Yes, several. The day has been, I grieve to say in many places it is not yet past, in which the greater part of the species, under the denomination of slaves, have been treated by the law exactly upon the same footing as, in England for example, the inferior races of animals are still. The day may come, when the rest of the animal creation may acquire those rights which never could have been withholden from them but by the hand of tyranny. The French have already discovered that the blackness of the skin is no reason why a human being should be abandoned without redress to the caprice of a tormentor. It may come one day to be recognized, that the number of the legs, the villosity of the skin, or the termination of the os sacrum, are reasons equally insufficient for abandoning a sensitive being to the same fate. What else is it that should trace the insuperable line? Is it the faculty of reason, or, perhaps, the faculty of discourse? But a full-grown horse or dog is beyond comparison a more rational, as well as a more conversable animal, than an infant of a day, or a week, or even a month, old. But suppose the case were otherwise, what would it avail? the question is not, Can they reason? nor, Can they talk? but, Can they suffer? Why should the law refuse its protection to any sensitive being? The time will come when humanity will extend its mantle over everything which breathes.”

“The quantity of pleasure being equal, push-pin is as good as poetry.”

“Stretching his hand up to reach the stars, too often man forgets the flowers at his feet. ”

“Bodies are real entities. Surfaces and lines are but fictitious entities. A surface without depth, a line without thickness, was never seen by any man; no; nor can any conception be seriously formed of its existence.”