According to Romans 10:17, Faith comes by HEARING and HEARING of the Word of God (with your ears). So, in Genesis 1:3, God changed the darkness to light by SPEAKING words, with His mouth, which He BELIEVED, in His heart and HEARING those words, in His ears. And in Matthew 8:26, Jesus changed a stormy situation to a calm situation by SPEAKING words, with His mouth, which He BELIEVED, in His heart and HEARING those words, with His ears.  Ephesians 5:1 says, 'be imitators of God, copy Him and follow His example, as children imitate their father'. So,  you too can overcome your doubt or change your darkness to light or change your stormy situations to calm situations by BELIEVING the Word of God on Overcoming Doubt, in your heart and then SPEAKING or READING the Word of God on Overcoming Doubt, with your mouth and HEARING and HEARING and HEARING, the Word of God on Overcoming Doubt, with your ears, daily. And in addition to SPEAKING or READING the Word of God ALOUD, you MUST also read the Word of God silently or mentally daily, in order to get a better understanding and revelation. Both audible and silent reading of the Word of God are extremely important for your spiritual growth and well-being. Do not neglect to do either.    

Christ who is in us, is greater than he(the Devil), who is in the world - 1 John 4:4(NKJV)

We do not waver at the promise of God, through unbelief, but we are strengthened in faith, giving glory to God and being fully convinced, that what He promised, He is also able to perform - Romans 4:20-21(NKJV) 

Because I believe, all things are possible for me - Mark 9:23(NKJV) 

To be continued