In this scripture, Paul reveals the connection between your mouth and your heart in the expression of your faith. Jesus said, "For whatever is in your heart determines what you say" (Matthew 12:34). Clearly, Jesus is the Word (John 1:1); therefore, when you speak the Word, you are speaking Jesus into your situation.
Faith begins in the heart, a heart that is fully persuaded that the promises of God are true. Once such faith is deep within your heart, your mouth will begin to reflect that faith by the words you say.
Whatever you believe in your heart about Jesus, you confess with your mouth. You believe that God raised Jesus from the dead, and you confess, "Jesus is Lord." You believe that Jesus paid for your healing, and you confess, "Jesus is my Healer." You believe that Jesus is your Provider, and you confess, "Jesus is my Shepherd."
If you call upon the name of the Lord in faith, you will receive that promise for salvation, blessing, healing, or deliverance. After you receive the promise, speak the Word and watch Jesus show up on the scene!