Find Comfort in the Bible?

Where to find scriptural help, regarding doubt:

Matthew 14:28-31
"Lord, if it's you," Peter replied, "tell me to come to you on the water."

"Come," he said. Then Peter got down out of the boat, walked on the water and came toward Jesus.

But when he saw the wind, he was afraid and, beginning to sink, cried out, "Lord, save me!" Immediately Jesus reached out his hand and caught him. "You of little faith," he said, "why did you doubt?"