Only God can fundamentally change us for the following reasons. (1) He made us; therefore, he alone knows how to remake us. (2) Fundamental changes must start with the heart and God alone understands and knows how to enter our hearts. (3) There can be no fundamental change without purification and cleansing of the soul and again, only God can accomplish that. (4) God is love. No threat or force but love can renew a person.