We ought to understand that while God knows all things beforehand, yet He does not predetermine all things. For He knows beforehand those things that are in our power, but He does not predetermine them. For it is not His will that there should be wickedness nor does He choose to compel virtue. So that predetermination is the work of the divine command based on fore-knowledge. But on the other hand God predetermines those things which are not within our power in accordance with His prescience. For already God in His prescience has prejudged all things in accordance with His goodness and justice.
An Exact Exposition of the Orthodox Faith