The God who extends grace to sinners is a holy and righteous God. He is the same God who struck Ananias and Sapphira dead — both believers — for testing the Spirit of the Lord. Therefore Paul wrote:
“Note then the kindness and the severity of God: severity toward those
who have fallen, but God’s kindness to you, provided you continue in
His kindness. Otherwise you too will be cut off.” Romans 11:22
These are uncomfortable passages for the God’s- only- attribute- is- grace crowd, but there they are. Those who are wise fear the Lord, as well as rejoice in His grace.