Romans 10:17 So faith comes by hearing [what is told], and what is heard comes by the preaching [of the message that came from the lips] of Christ (the Messiah Himself).
Remember that old commercial, eat your Wheaties so you can be healthy? Well the same is true to be spiritually strong you have to sort of eat your wheaties. But, unlike the natural body our spirit needs the Word to be Strong. God is our Source and we need Him to be strong. Feeding ourselves the Word of God will keep us strong in faith, strong in joy and full of the power of God.
Everyday, all the time —be eating the Word of God, hear it, read it, meditate on it—think it. apply it to your life and you will be that overcomer you are called to be because you will have Jesus (the Overcomer) alive on the inside of You.