Read Matthew 12:38-42
Unbelief is a powerful stubborn obstacle in the heart of man. But here, The Lord Jesus addresses the unbelief in the covenant community of God's people, which is even more fearful. How easy to feed this stubborn unbelief by looking for signs from God instead of walking by faith, or by being unwilling to repent, or havign an apathy toward God's wisdom. What is the state of your faith?