How do we know God's mercy for Jacob is true?

In Amos 7, the prophet Amos fervently prays for Israel, pleading for forgiveness on behalf of the people. God's response, where He 'repented' for the judgment, serves as a testament to His steadfast love and mercy. The repeated lines in verses 2 and 5 reveal that God is not indifferent to the sufferings of His people, but desires to show compassion. This interaction illustrates a critical aspect of sovereign grace theology, that God's mercy is extended even to those who are small and seemingly without strength, affirming God's character as faithful and gracious.