To a man whose mind is free there is something even more intolerable in the sufferings of animals than in the sufferings of man. For with the latter it is at least admitted that suffering is evil and that the man who causes it is a criminal. But thousands of animals are uselessly butchered every day without a shadow of remorse.
—Romain Rolland
couplet
In a poem, a pair of lines that are the same length and usually rhyme and form a complete thought. Shakespearean sonnets usually end in a couplet.