Christians believe in natural law as God's moral law written on the heart, showing ethical standards beyond divine revelation. Medieval theologians like Thomas Aquinas combined Stoic ideas with God's law to create a detailed view of natural law. Natural rights, developed by medieval scholars, claim that certain rights should be recognized by all legal systems. Some Christians have seen natural rights as individualistic, but many now see natural law and divine command as compatible. New natural law and neo-Aristotelian naturalism address criticisms of natural law thinking. Christian thinkers now see natural law as a universal moral standard reflecting God's purpose in nature.