"Sometimes captured from the great arboreal freedom of their jungle homes, monkeys are closely confined in cages only three or four feet square. … They can never sit or lie down on a flat, soft or yielding surface. Little wonder that by the time they are needed for the knife or the needle they are so crazed or inert that they are no longer representative examples of animal life. Psychologists who study the behaviour of thousands of such creatures annually, rarely make allowances for the fact that their pathetic subjects have been so deprived that they have become more like monsters than animals. Many people who have experienced close affectionate relationships with individuals of other species testify to the considerable potential for emotional and intellectual development that animals have. When properly cared for a pet dog or cat can develop great subtleties of behaviour that the laboratory animal never shows. Those who have been fortunate enough to closely observe unfrightened animals living in the wild are often struck by the complexity and richness of the life they lead. These positive pleasures the laboratory animal never knows; for him the same four white walls and the smell of disinfectant."

“Are there then any moral foundations on which we can all agree, at least to some extent? I believe there are and that they are these: pain is bad, and so, causing unnecessary pain to others is wrong.”

“A sound moral argument requires both factual and moral premises. Yet there has been little intelligent dialogue at either level. The mumbling of slogans must no longer suffice. We must demand more of our leaders …”

“The 1960s revolutions against racism, sexism and classism nearly missed out the animals. This worried me. Ethics and politics at the time simply overlooked the nonhumans entirely. Everyone seemed to be just preoccupied with reducing the prejudices against humans. Hadn’t they heard of Darwin? I hated racism, sexism and classism, too, but why stop there? As a hospital scientist I believed that hundreds of other species of animals suffer fear, pain and distress much as I did. Something had to be done about it. We needed to draw the parallel between the plight of the other species and our own. One day in 1970, lying in my bath at the old Sunningwell Manor, near Oxford, it suddenly came to me: SPECIESISM!”

“Perhaps there is too much talk of justice, equality and liberty in political philosophy, and not enough about suffering. It is suffering that matters morally …”

“olitical policy should be based, not upon mere opinion, nor upon a set of knee jerk reflexes, but upon a scientific concern for the facts and an intelligent and open moral argument.”

“Misleading may be the claims that procedures are carried out under anaesthesia. Restraining devices and paralysing drugs can today be so effective that an anaesthetic is often unnecessary from the purely practical point of view. The risk of giving a dose too large and thereby losing an expensive chimpanzee, for example, may often tempt a scientist or technician, inexperienced with sophisticated anaesthetic techniques, to give a dose too small, from which the animal quickly recovers — but not of course until after it has been strapped securely to the operating table.”