My quote that you bolded,
If some are destined for evil then is it really just to judge them on something predetermined?
God wishes that all may be saved but of course there is an exception.
Unbelief in Christ.
But I agree with your whole statement. God's grace is a gift. He has made the gift open all who will accept it.
But did God purpose in eternity to save all men w/o exception? God's decretive will and his desirous will are two different things.
Also, have you ever asked yourself: Why would an omniscient God who knows all things offer his gift of grace to people He knew in eternity would never accept it? Hasn't God always known the end from the very beginning?
Another question: Why would God offer the gift of grace to people He never knew in eternity?