To be nonviolent to human beings and to be a killer or enemy of the poor animals is Satan's philosophy. In this age there is always enmity against poor animals, and therefore the poor creatures are always anxious. The reaction of the poor animals is being forced on human society, and therefore there is always strain of cold or hot war between men, individually, collectively or nationally.

Srimad-Bhagavatam, First Canto: Creation (ed. The Bhaktivedanta Book Trust, 1972) - ISBN: 9789171496348