How do we know God's plan is unchangeable?

The immutability of God's plan is rooted in His eternal nature and wisdom. Ephesians 1:11 states, 'In him we have obtained an inheritance, having been predestined according to the purpose of him who works all things according to the counsel of his will.' This signifies that God's decrees and plans are not subject to human whims or changes. Historical narratives, such as the life of Joseph, demonstrate how betrayals and evil actions ultimately serve God's good purposes, firmly establishing that man may propose, but God ultimately disposes according to His unchangeable will.