Proverbs 3:24-26
When you lie down, you will not be afraid; when you lie down, your sleep will be sweet. Do not be afraid of sudden fear nor of the storm of the wicked when it comes; for the Lord will be your confidence, firm and strong, and will keep your foot from being caught.

When the Bible becomes so ingrained in our lives and the truths written become our reality, we will find perfect peace. We will not be shaken in a storm or tempted by evil. We will know and not doubt that the promises of God are real. It takes time, faith, and practice, but we can attain all that God promised.