Mark 11:24

For this reason I am telling you, whatever things you ask for in prayer (in accordance with God’s will), believe (with confident trust) that you have received them, and they will be given to you.

Faith and doubt are choices. When we believe the word of God about healing, finances, wisdom, and supply of needs, we trust our knowledge of God’s promises. If we don’t know or believe in those promises, God can’t help us. We are to answer our problems with the word of God written in scripture. The word is the truth to shut down the lies of the enemy.