Hebrews 4:12, "For the word of God is quick, and powerful, and sharper than any two edged sword, piercing even to the diving asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart."
The document we call the Bible is the Word of God. The Greek word for quick in Hebrews 4:12 means "alive" or "living." So
God's Word is alive and has the power to judge the intents of our heart and to transform us who are dead in trespasses & sin into a new creation fit for heaven, and continues to change us into the image of His Son if we continue in His Word. The transformation brought about by God's Word is a lifelong process.