Every single act of cruelty contributes something towards generating in the mind an habit of cruelty. - Thomas Young (animal welfare writer)

In offering to the public a book on Humanity to Animals, I am sensible that I lay myself open to no small portion of ridicule; independent of all the common dangers to which authors are exposed. To many, no doubt, the subject which I have chosen will appear whimsical and uninteresting, and the particulars into which it is about to lead me ludicrous and mean. From the reflecting, however, and the humane I shall hope for a different opinion and of these the number, I trust, among my countrymen is by no means inconsiderable. The exertions which have been made to diminish the sufferings of the prisoners, and to better the condition of the poor, the flourishing state of charitable institutions; the interest excited in the nation by the struggles for the abolition of the slave-trade; the growing detestation of religious persecution—all these and other circumstances induce me to believe that we have not been retrograding in Humanity during the present century: and I feel the more inclination and encouragement to execute the task to which I have set myself, inasmuch as humanity to animals presents itself to my mind as having an important connection with humanity towards mankind.

[I]t is our duty to cultivate humanity towards animals […] not content merely to rescue animals from pain but to leave them still more abundantly gratified.

A man who has made a tolerable progress in humanity, will adopt, and ever bear in mind, the principle of increasing, as far as lies within his power, the quantity of pleasure in the world, and diminishing that of pain: he will establish this to himself as a constant and inviolable rule of action, and in carrying it into practice he will not overlook one created thing that is endowed with faculties capable of perceiving pleasure and pain. He will reflect on who it was that gave these faculties and remember that they were not given to be sported with. He will not esteem the meanest of animals beneath the notice of his humanity because, in the meanest of them, the wisdom and power of the all-benevolent Being are displayed. This is the Being without whom not a single sparrow shall fall to the ground and whose bounty feeds the young ravens that call upon him. His sensibility will be tremblingly alive to the sensations of all animated nature, and he will feel for everything that is capable of feeling: he will look upon pity, kindness, and mercy toward his own species as the weightier matters of humanity, but at the same time, he will consider the humane treatment of animals as more than the tithe of the anise and cummin of it. He will scrupulously do his duty in the former, and in the latter, he will not leave it undone.