1 John 5:14-15
Now this is the confidence that we have in Him, that if we ask anything according to His will, He hears us. And if we know that He hears us, whatever we ask, we know that we have the petitions that we have asked of Him.
(following taken from DAVID GUZIK COMMENTARY ON THE BIBLE, Studylight.org)
THIS IS THE CONFIDENCE THAT WE HAVE IN HIM: John has developed the idea of confidence in Him. In the previous verse, 1 John 5:13, he wrote to you who believe in the name of the Son of God, that you may know you have eternal life. Now, for those who know they have eternal life, John relates the idea of confidence in Him to prayer…..
….If something is God’s will, why doesn’t He just do it, apart from our prayers? Why would He wait to accomplish His will until we pray? Because God has appointed us to work with Him as 2 Corinthians 6:1 says: as workers together with Him. God wants us to work with Him, and that means bringing our will and agenda into alignment with His. He wants us to care about the things He cares about, and He wants us to care about them enough to pray passionately about them….
….WE KNOW THAT WE HAVE THE PETITIONS THAT WE HAVE ASKED OF HIM: When we ask according to God’s will; when we pray the promises of God - we have this confidence and so pray with real and definite faith…..
….Prayer should be so much more than casting wishes to heaven. It is rooted in understanding God’s will and promises according to His Word, and praying those promises into action. For each prayer request, we should mentally or vocally ask, “What possible reason do I have to think that God will answer this prayer?” We should be able to answer that question from His Word….
The most powerful prayers in the Bible are always prayers which understand the will of God, and ask Him to perform it. We may be annoyed when one of our children says, “Daddy, this is what you promised, now please do it,” but God is delighted. It shows our will aligned with His, our dependence on Him, and that we take His word seriously….