How do we know that God speaks with power?

Hebrews 4:12 states that the word of God is 'quick and powerful,' emphasizing its living nature and ability to penetrate the hearts of those who hear it. When God speaks, His words carry creative power, as seen in His creation of the world from nothing. This authority is not limited to physical creation; it extends to spiritual rebirth and transformation. In the sermon, it is made clear that God's call to Abraham to leave Ur was obeyed, illustrating the irresistible nature of God's grace that works in the hearts of His chosen people.