Jesus never mentioned unanswered prayer. He had the unlimited certainty of knowing that prayer is always answered.

Do we have through the Spirit of God that inexpressible certainty that Jesus had about prayer, or do we think of the times when it seemed that God did not answer our prayer?

Jesus said, “…everyone who asks receives…” (Matthew 7:8). Yet we say, “But…but…” God answers prayer in the best way—not just sometimes, but every time. However, the evidence of the answer in the area we want it may not always immediately follow. Do we expect God to answer prayer?

from My Utmost for His Highest