Matthew Scully
From Christian Vegetarian Association (CVA)

Compassion for animals doesn’t drain away some finite reserve of moral energy and idealism, to the detriment of human welfare, but surely adds to the supply.
 
...[I]t is a terrible thing that religious people today can be so indifferent to the cruelty of the farms, shrugging it off as so much secular, animal rights foolishness. They above all should hear the call to mercy. They above all should have some kindness to spare. They above all should be mindful of the little things, seeing, in the suffering of these creatures, the same hand that has chosen all the foolish things of the world to confound the wise, and the weak things to confound the things which are strong. 'Who so poor,' asked Anna Kingsford more than a century ago, 'so oppressed, so helpless, so mute and uncared for, as the dumb creatures who serve us -- they who, but for us, must starve, and who have no friend on earth if man be their enemy? 

- Quote from Dominion: The Power of Man, the Suffering of Animals, and the Call to Mercy

Let's just call things what they are. When a man's love of finery clouds his moral judgment, that is vanity. When he lets a demanding palate make his moral choices, that is gluttony. When he ascribes the divine will to his own whims, that is pride. And when he gets angry at being reminded of animal suffering that his own daily choices might help avoid, that is moral cowardice.

- Quote from Dominion: The Power of Man, the Suffering of Animals, and the Call to Mercy