In his book By Grace Alone, Sinclair Ferguson identifies four major "fiery darts" Satan uses to unsettle believers and rob them of their assurance and peace in the gospel:

• Fiery Dart 1: "God is against you," Satan says. "He is not really for you. How can you believe he is for you when you see the things that are happening in your life?"
• Fiery Dart 2: "I have accusations I will bring against you because of your sins," Satan argues. "What can you say in defense? Nothing."
• Fiery Dart 3: "You can say you are forgiven, but there is a payback day coming—a condemnation day," Satan insinuates. "How will you defend yourself then?"
• Fiery Dart 4: "Given your track record, what hope is there that you will persevere to the end?" Satan asks.