Prayer of Alarm Clock

[S] Matthew 21:22 --  ²²"And all things you ask in prayer, believing, you will receive."

[O] Passages like these are very simple and yet quite challenging for me because it seems to say that if I believe anything and pray I will get my prayer answered.  But how would I know when I've truly prayed a prayer of complete believing?  Is the reason for not receiving what I ask for because of my unbelief or because God is not allowing it?  More I think about this more confusing I get so I just pass over these passages thinking it must be for someone else who can understand it, or who is spiritually more mature to apply this into their spiritual walk with God.

However, as I was meditating on this today, I heard a small voice asking me whether that may be an excuse I'm using to lift up my prayers selectively -- ones I feel good and confident about vs. the ones I'm unsure of.  What that voice convicted me today was I should not filter my prayers to God but just "dump" them all to Him because He can handle it and regardless of the outcome, I will learn to walk such a powerful and confident life in God which this passage refers to.

[A] As an application to this revelation, I want to lean on God to wake me up without an alarm clock.  This is one area I'm struggling to be consistent, and so I want to believe that God through the Holy Spirit will wake me up each morning at the most appropriate time.

[P] Dear God, even though what I'm going to apply this passage may seem trivial, I want to start with a baby step to reach a prayer life that is mature and powerful as Jesus said in this passage.  In Jesus' name.  Amen.