In religion and ethics, the sanctity of life, sometimes described as the inviolability of life, is a principle of implied protection regarding aspects of sentient life that are said to be holy, sacred, or otherwise of such value that they are not to be violated. This can be applied to humans, animals or micro-organisms; for instance, in religions that practice Ahimsa, both are seen as holy and worthy of life. Sanctity of life sits at the centre of debate over abortion and euthanasia.
In Christianity
The sanctity of life principle, which is often contrasted with the "quality of life" to some extent, is the basis of all Catholic teaching about the fifth commandment in the Ten Commandments.
In Judaism
Pikuach nefesh allows the Jewish person to override all other Jewish laws and practices in order to preserve human life. It places the conservation of humanity and the survival of a human being above every other possible thing. It applies to both saving the lives of Jews and non-Jews.
All denominations of Judaism allow abortion to save the life of the mother, but there is no common consensus for other situations in which abortion could be used. Due to the treatment of a foetus as a part of the mother, but not as a separate human being, this is often cited to permit abortion by Jewish people.
In Islam
Islam considers all life forms sacred, but puts humans above other living things. Islam considers the unlawful killing of a person on the same level as the killing of all humanity. The same is applicable in the inverse: saving a life is as important as saving the entire of humanity.
The Qur'an never explicitly refers to abortion, but other teachings can be applied to the matter. Muslims believe that ensoulment occurs on the 120th day of gestation. Before ensoulment, abortion is allowed for foetal anomalies. After ensoulment, all schools of Islam allow abortion to save the life of the mother, and in the case of an intrauterine death (miscarriage), but on little other grounds. However, there is a growing movement to allow abortion for malformed foetuses whose deaths are inevitable shortly after birth. The inability to provide for a foetus is generally dismissed as an acceptable reason, but some schools of thought are more lenient on the matter.
