For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.
Hebrews 4:12

Jesus answered, "It is written: 'Man does not live on bread alone, but on every word that comes from the mouth of God.'"
Matthew 4:4

All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, so that the man of God may be thoroughly equipped for every good work.
2 Timothy 3:16-17

Loving God means keeping his commandments, and his commandments are not burdensome. For every child of God defeats this evil world, and we achieve this victory through our faith. And who can win this battle against the world? Only those who believe that Jesus is the Son of God.
1 John 5:3-5