How do Christians know that God is for them?

In Psalm 56:9, the psalmist states, 'This I know, for God is for me.' This knowledge is rooted in the Gospel, where Jesus assures believers that He came to save sinners. God's people can confidently claim that God is for them because they recognize their identity as sinners in need of mercy, and they trust in Christ's sacrificial love on their behalf. This assurance is further confirmed through the Holy Spirit's work in their hearts, reminding them of their election and God's unwavering support.