Irādah refers to divine will in relation to the specification of a possible event; mashīʾah is used closely to will in this passage; and taqdīr refers to the determination of specific conditions and limits. Theological schools analyze these terms in different ways.
A person choosing an action at a particular time is an actual event; its existence is not outside divine volition. But whether it is virtuous or sinful is determined by the separate standards of command and prohibition. Therefore, saying that something occurred within God's will does not mean that God morally approved it.
The argument depends on distinguishing the scope of creative will from the scope of religious approval.