“For the Word that God speaks is alive and full of power, making it active, operative, energizing, and effective, it is sharper than any two edged sword.” Hebrews 4:12a (Amplified)
When Jesus was tempted by the devil, as told in Matthew 6, He responded to satan with the Word of God.
The first temptation was for food and Jesus said “It has been written, man shall not live, be upheld, and sustained by bread alone, but by every word that comes forth from the mouth of God.”
The second temptation was for protection and Jesus said “You shall not tempt, test or try the Lord your God.”
The third temptation was for possessions and fame, Jesus said “You shall worship the Lord our God and Him alone shall you serve.”
Then the devil departed from Him.
(Now go back and read the three verses Jesus spoke, but using the first person in each verse.) That’s powerful!
I believe it is imperative that we speak the Word outloud to do spiritual battle with our enemy.