So we can make our own choice in regard to His will.. Just because He already knows if we are going to accept His will or reject His will does not mean we are unable to make that choice.. For His judgement of humanity to be Justified We must have the free will to either embrace the will of God as truth and good or reject the will of God as lies and evil.... Whilst we can never conform and do the will of God 100% because we are faulty human beings with a sin problem we can still believe that Gods will is good and true and trust in His solution to our sin problem..
The next scripture hints at the reality of the break between our time and Gods time..
2 Peter 3:KJV
8 But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day.
Note it does not just leave it as One God day is as 1000 years to us.. But it says also that 1000 years are as one day to us.. Gods time is totally un-geared to our universe time..