How do we know God fills empty vessels?

We know that God fills empty vessels based on the biblical narrative found in 2 Kings 4, where the widow's obedience led to the miraculous filling of her empty vessels with oil. This operational principle is also echoed in the New Testament, where Jesus calls sinners—those who recognize their emptiness—to Him. Moreover, believers’ lives provide testimony to this truth. They can point to moments where they realized their need and how God subsequently filled them with His presence and grace. Thus, the assurance that God fills empty vessels is a central tenet of sovereign grace theology, reinforced by Scripture and the experiences of the faithful.