Hebrews 11:6 contains a foundational principle of prayer. The Message Bible says, "It's impossible to please God apart from faith. And why? Because anyone who wants to approach God must believe both that he exists and that he cares enough to respond to those who seek him."
We cannot pray apart from faith and believing. God's greatest pleasure is when we dare to believe that he cares enough to answer our prayers.
Faith and belief are the Biblical principles that are required
for receiving anything from God.
There is a difference between belief and faith. Belief is the acknowledgement that something exists. Faith is acting like God is telling us the truth all of the time about everything. When we pray in faith, we position ourselves to receive God's answer because we believe that it will come to pass.
To work God's principles we must believe God's word
and act upon it to receive divine assistance.