Epictetus, Golden Sayings 22

If God had made that part of His own nature, which He severed from Himself and gave to us, liable to be hindered or constrained either by Himself or any other, He would not have been God, nor would He have been taking care of us as He ought. 

If you choose, you are free. If you choose, you need blame no man, accuse no man. All things will be at once according to your mind and according to the Mind of God.