How does God's immutability relate to His decrees?

God's immutability is intricately tied to His decrees, meaning that once God has purposed something, it is unchanging and will be fulfilled in accordance with His will. Hebrews 6:17-18 emphasizes that God's counsel and promise are immutable. This means no external factors or the actions of humanity can disrupt God’s eternal plans. Believers can take comfort in knowing that God's decrees regarding salvation, grace, and their ultimate destiny are stable and unassailable, providing a firm foundation for their faith and hope.