How Many Wills of God?

Here's the John Piper article referenced in our study on Decision Making and the Will of God. Below is a short snippet.

The most compelling example of God's willing for sin to come to pass while at the same time disapproving the sin is his willing the death of his perfect, divine Son. The betrayal of Jesus by Judas was a morally evil act inspired immediately by Satan (Luke 22:3). Yet in Acts 2:23 Luke says, "This Jesus [was] delivered up according to the definite plan (boule) and foreknowledge of God." The betrayal was sin, and it involved the instrumentality of Satan; but it was part of God's ordained plan. That is, there is a sense in which God willed the delivering up of his Son, even though the act was sin.