There is no doubt that the death of Jesus Christ on the cross was both very bad and very good, at the same time.  It had all the marks of Satan's evil destructive malice against God; and yet it secured salvation for all who trust in the sacrifice of Jesus (see www.crosscheck.org.uk).  However, some people get confused.  They think that if the betrayal of Judas was all part of God's plan leading Jesus to His death, then surely, he should not be blamed for his thoughts and actions.
 
But these verses resolve the problem. The Lord Jesus clearly stated that His death and the events leading up to it were all known to Father God - and more than that, He had decreed them.  At the same time, He knew who would betray Him. He knew that Judas would be held fully accountable for his deliberate betrayal of the Saviour.  Even though God would bring blessing to millions through Satan's manipulation of Judas, the deceived man would bear the full weight of God's anger for selling His Lord.
 
It is beyond our minds to find a formula which makes logical sense to us: that is why we need the words of Jesus to assure us that two things which we think must be mutually incompatible, are both true at the same time. The work of Judas was very bad and the plan of God was very good.  The man was fully responsible and would be eternally punished for his sin, and the Lord would be eternally praised for achieving our salvation through the death of Christ.

As always, we are responsible for the choices we make, and for believing the lies which Satan speaks to our hearts.  And, as always, God knows how to weave His plan through the darkest human wickedness, as well as through lives fully devoted to Him (Romans 8:28).  The question is never, ‘Will God succeed in His plan?’, but ‘Will I receive the blessing which comes from making choices which willingly accept His Lordship and cooperate with Him?’  The answer to both questions is ‘Yes’.  But what if we reject His Lordship and work against Him instead of with Him?  Peter wrote, “Be alert and of sober mind. Your enemy the devil prowls around like a roaring lion looking for someone to devour.  Resist him, standing firm in the faith …” (1 Peter 5:8-9).  May we allow the Lord to help us to resist evil and work with Him.