A human being is always incomplete, if she/he does not respect animal rights as much as human rights. You can often judge a good and a bad human by his/her attitude, respect and treatment towards animals.
Life is precious and dear to all beings, to humans as much as to our animal friends. We must treat our fellow animals with the respect and kind treatment they deserve. If the walls of slaughter-houses become transparent, metaphorically and/or literally, no one would ever dare to eat animals the way people are doing it today. We must appreciate and respect the fact that animals have the rights, as much as humans do.
Man...is a tame or civilized animal never the less, he requires proper instruction and a fortunate nature, and then of all animals he becomes the most divine and most civilized but if he be insufficiently or ill- educated he is the most savage of earthly creatures.
You cannot play with the animal in you without becoming wholly animal, play with falsehood without forfeiting your right to truth, play with cruelty without losing your sensitivity of mind. He who wants to keep his garden tidy doesn't reserve a patch for
Love anything and your heart will be wrung and possibly broken. If you want to make sure of keeping it intact you must give it to no one, not even an animal. Wrap it carefully round with hobbies and little luxuries avoid all entanglements.
From one Soul of the Universe are all Souls derived. . .Of these Souls there are many changes, some into a more fortunate estate, and some quite contrary. . .Not all human souls but only the pious ones are divine. Once separated from the body, and after the struggle to acquire piety, which consists in knowing God and injuring none, such a soul becomes all intelligence. The impious soul, however, punishes itself by seeking a human body to enter into, for no other body can receive a human soul it cannot enter the body of an animal devoid of reason. Divine law preserves the human soul from such infamy. . .The soul passeth from form to form and the mansions of her pilgrimage are manifold. Thou puttest off thy bodies as raiment and as vesture dost thou fold them up. Thou art from old, O Soul of Man yea, thou art from everlasting.
We know what the animals do, what are the needs of the beaver, the bear, the salmon, and other creatures, because long ago men married them and acquired this knowledge from their animal wives. Today the priests say we lie, but we know better.
After several minutes of utterly dull conversation I began to think of her not as a woman but as a human, then not as a human but as an animal, then not as an animal but as a source of high-grade protein.
Also attending Saturday’s festivities were Ali MacGraw`s son, filmmaker Josh Evans, and his wife, actress Charis Michelsen-Evans. “I got teary-eyed,” Charis says about touring the sanctuary. “To see all the animals so happy, well, it just touches my heart.” (Interview at Best Friends animal sanctuary) 
At night always carry in your heart something from Holy Scriptures to bed with you, meditate upon it like a ruminant animal, and go softly to sleep; but this must not be too much, rather a little that may be well pondered and understood, that you may find a remnant of it in your mind when you rise in the morning.
Cats are autocrats of naked self-interest. They are both amoral and immoral, consciously breaking rules. Their evil look at such times is no human projection: the cat may be the only animal who savors the perverse or reflects upon it.