The word of God is alive and powerful, sharper than any two-edged sword, piercing even to the dividing asunder of the soul and the spirit, and of the joints and the marrow, and is a critic of thoughts and intents of the heart. (Heb. 4:12)

All Scripture is God-breathed, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness; that the man of God might be mature, thoroughly furnished unto all good works. (2 Tim. 3:16-17)

Study to show thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth. (2 Tim. 2:15)