Abraham's impact on human civilization cannot be overstated. He introduced the concept of ethical monotheism, establishing the idea that there is one God who cares about human morality and justice. This single idea transformed how billions of people across thousands of years would understand the divine, ethics, and their place in the universe. The three major world religions that trace their spiritual lineage to Abraham—Judaism, Christianity, and Islam—collectively represent more than half of the world's population today. Abraham's emphasis on hospitality, justice, and compassion toward strangers became core values in these traditions. His covenant with God established a special relationship between the divine and humanity, based not on fear or capricious gods, but on mutual commitment, moral behavior, and faith. Abraham's legacy teaches that one person's conviction and courage can fundamentally alter the trajectory of human civilization.