How do we know the Word of God is living and powerful?

Hebrews 4:12 declares that the Word of God is not a mere collection of historical texts, but a living entity that is powerful and effective. It is described as sharper than any two-edged sword, signifying its ability to penetrate the deepest parts of our being. This means it can expose our innermost thoughts and intentions, revealing truths about ourselves that we might otherwise ignore. The transformative effect of the Word on believers' lives, as seen in their capacity for repentance and change, attests to its living nature.