The difference comes down to free will. We have in our nature both good impulses and selfish impulses. God tells us what is good, but He gives us the choice as to which we choose.
I call heaven and earth to witness against you this day, that I have set before you life and death, blessing and curse; therefore choose life, that you and your descendants may live (Deuteronomy 30:19)
Faith Leaves it as the mystery of God's sovereignty and accepts it in humble obedience.
Becky