How do we know that God's mercies are sure?

The surety of God's mercies is rooted in the covenant promises He makes with His people, which are not contingent upon human actions or decisions. Isaiah 55:1-3 illustrates this beautifully, emphasizing that God's invitation to come and partake in His goodness is free of charge, based on His grace. Believers can trust in the unwavering nature of these mercies because it is God who initiates and maintains the relationship; it is not up to humans to secure their own salvation. When we understand this, we recognize that to forsake these mercies is to deprive oneself of the true sustenance of life found only in God’s grace.