When does Human Life Begin? Our traditions, politics, and common sense teach us this is when the egg & sperm unite at fertilization. God’s Word teaches us that Adam became a Living Soul after receiving the Breath of Life. Life is in the Blood and an analysis of the Hebrew roots of these words show us Blood and Life are inseparable. Biology and genetics teach us that the earliest the fertilized egg receives nourishment, from blood, is at the 8th day after fertilization. Life then begins at the 8th day – as God’s Word shows us how we can properly interpret and apply genetics and biology.