"What does reverence for life say about the relations between man and the animal world?
"Whenever I injure life of any sort, I must be quite clear whether it is necessary. Beyond the unavoidable, I must never go, not even with what seems insignificant. The farmer, who has mown down a thousand flowers in his meadow as fodder for his cows, must be careful on his way home not to strike off in wanton pastime the head of a single flower by the roadside, for he thereby commits a wrong against life without being under the pressure of necessity.
"Those who experiment with operations or the use of drugs upon animals, or inoculate them with diseases, so as to be able to bring help to mankind with the results gained, must never quiet any misgivings they feel with the general reflection that their cruel proceedings aim at a valuable result. They must first have considered in each individual case whether there is a real necessity to force upon any animal this sacrifice for the sake of mankind. And they must take the most anxious care to mitigate as much as possible the pain inflicted. How much wrong is committed in scientific institutions through neglect of anaesthetic, which to save time or trouble are not administered! How much, too, through animals being subjected to torture merely to demonstrate to students generally known phenomena! By the very fact that animals have been subjected to experiments, and have by their pain won such valuable results for suffering humanity, a new and special relation of solidarity has been established between them and us. From that springs for each one of us a compulsion to do to every animal all the good we possibly can. By helping an insect when it is in difficulties, I am only attempting to cancel part of man's ever new debt to the animal world. Whenever an animal is in any way forced into the service of man, every one of us must be concerned with the sufferings which for that reason it has to undergo. None of us must allow to take place any suffering for which he himself is not responsible, if he can hinder it in any way. He must not soothe his conscience with the reflection that he would be mixing himself up in something which does not concern him. No one must shut his eyes and regard as non-existent the sufferings of which he spares himself the sight. Let no one regard as light the burden of his responsibility. While so much ill-treatment of animals goes on, while the moans of thirsty animals in railway trucks sound unheard, while so much brutality prevails in our slaughter-houses, while animals have to suffer in our kitchens painful death from unskilled hands, while animals have to endure intolerable treatment from heartless men, or are left to the cruel play of children, we all share the guilt."