The sanctity of life is the belief that human life has intrinsic value and should be protected because it is sacred or inviolable. Traditionally, this principle is rooted in religion, particularly Christianity, where Genesis 1:26 teaches that humans are made imago Dei, in the image of God. As a result, life is seen as God-given and only God has the authority to give or take life. Similar ideas can be found in other religious traditions, such as Islam and Judaism, which also emphasise the sacredness of human life. However, the importance of human life is not only defended by religion. Philosophers such as Kant argue through reason that humans have intrinsic worth because of their rationality and autonomy, and modern human rights frameworks protect life regardless of religious belief. Despite this, applying the religious principle of sanctity of life to modern debates about euthanasia is challenging in a multicultural and largely secular British society. Overall, although the language of “sanctity” may no longer be appropriate for everyone, the underlying principle that human life has inherent value remains fundamental in decision-making about euthanasia.

One key reason why the sanctity of life remains important in decisions about euthanasia is that it provides a clear moral boundary against the intentional taking of human life. Religious supporters argue that if life is sacred, then deliberately ending it, even to relieve suffering, is morally wrong. This view is strongly supported by Genesis 1:26, which implies that humans reflect God’s nature, and by the commandment “Do not murder.” From this perspective, euthanasia undermines the absolute value of life by making its worth conditional on factors such as health, independence or quality of life. This concern extends beyond religion, as Kantian ethics also rejects euthanasia on rational grounds. Kant argued that humans have intrinsic value and must always be treated as ends in themselves, not merely as means to an end such as avoiding pain. Allowing euthanasia risks treating life as disposable when it no longer meets certain standards. The importance of this principle lies in its protective function: it safeguards the most vulnerable members of society, such as the elderly, disabled and terminally ill, from pressure to end their lives. Even in a secular context, this boundary is essential to prevent a “slippery slope” where the value of life becomes negotiable. Therefore, the sanctity of life, or at least the belief in the inherent worth of human life, plays a crucial role in ethical decision-making about euthanasia.

A further reason for the continued importance of this principle is that it underpins human rights and legal protections in modern society. The right to life is a foundational human right, recognised in documents such as the Universal Declaration of Human Rights. This principle applies regardless of religion and reflects the belief that all human lives are equally valuable. In decisions about euthanasia, maintaining this commitment helps to ensure fairness and equality before the law. If euthanasia were widely accepted, critics argue that some lives may be seen as less worth preserving than others, particularly those involving chronic illness or disability. This could reinforce harmful social attitudes that equate dignity with independence or productivity. The sanctity of life principle challenges this by affirming that dignity is inherent, not earned. Even when suffering is severe, life itself still has value. This does not mean that suffering should be ignored, but it suggests that the moral response should focus on palliative care and support rather than ending life. As a result, the importance of sanctity of life lies in shaping compassionate responses that respect both human dignity and equality. Removing this principle from euthanasia debates risks weakening the moral foundation of human rights altogether.

However, a strong counterclaim is that the sanctity of life is less important in decisions about euthanasia because it can conflict with personal autonomy and compassion. Supporters of euthanasia argue that preserving life at all costs can lead to prolonged suffering, loss of dignity and a lack of control over one’s own death. In a multicultural society, many people do not accept religious arguments based on God or sacredness, and therefore see the sanctity of life as an outdated concept. From this perspective, quality of life is more important than simply being alive, and individuals should have the right to choose a dignified death. This view is supported by utilitarian thinkers who focus on reducing suffering, and by campaigners who argue that banning euthanasia can be cruel rather than compassionate. Despite this, rejecting the sanctity of life entirely creates serious ethical problems. While autonomy is important, it is not absolute, especially when decisions may be influenced by depression, fear, or social pressure. Without a strong principle affirming the inherent value of life, vulnerable individuals may feel a duty to die to avoid being a burden on others. Furthermore, compassion does not necessarily require ending life; advances in palliative care show that pain and distress can often be managed effectively. By retaining the core idea of sanctity of life—without relying solely on religious language—society can balance compassion with protection. The principle reminds decision-makers to prioritise care, support and dignity without crossing the moral line of intentionally causing death. Therefore, while autonomy and compassion matter, they do not outweigh the importance of recognising the inherent value of human life.

In conclusion, although the religious language of the sanctity of life may be difficult to apply directly in a modern, multicultural society, the principle that human life has inherent value remains fundamental in decisions about euthanasia. The strongest reason for this is that it protects the vulnerable, underpins human rights, and prevents life from becoming conditional on subjective judgments about quality or usefulness. While compassion and autonomy must be taken seriously, they should not replace the commitment to the equal worth of all human lives. Moving forward, society should continue to uphold this principle—perhaps using secular language of human dignity and rights—while investing in palliative care and support, ensuring that the response to suffering is not to end life, but to value and care for it until the end.