What Is Christian Living? “But this shall be the covenant that I will make with the house of Israel; After those days, saith the LORD, I will put my law in their inward parts, and write it in their hearts; and will be their God, and they shall be my people” (Jeremiah 31:33). The Christian life is a holy life. Holiness begins on the inside. The inward experience will affect the outward actions and appearance.