It is necessary that He should know other things as intelligible and possible, not that He should will other things to come to actual existence. Once more the ideal order is necessary, but not the actual order of creation. The one necessary actuality is God. Though creatures are means to God's end, they are not necessary means to any necessary end of His: therefore their existence is not necessarily willed by Him, albeit their possibility is necessarily discerned.
Of God and His Creatures: 1.81