We observe a vital element of faith in this reminder of Sarah’s conception of Isaac. Faith judges God to be faithful and true to His word. God promised her husband, Abraham that of his seed, all the nations would be blessed. That promise would not come through Ishmael, the handmaid Hagar’s son, but Sarah herself (Gen. 17:15-21). Although now ninety years old (and Abraham was ninety-nine), Sarah judged God to be faithful. Sarah’s conception is a beautiful account of the power of faith in God to do what He said He would (Rom. 4:17-22). In like manner, we judge God to be faithful to His word. Such a judgment is the seed of faith that germinates into trustful obedience. Faith is not a blind leap into the dark. It is a confident step of following His word because He is faithful. We walk by faith because we know whom we have believed. We are sure He will keep what we have committed to Him until the day of eternity (2 Cor. 5:7; 2 Tim. 1:12; 1 Pet. 4:19). The strength of faith comes from trusting the integrity of God to do what He says (Titus 1:2). God will keep His word. Now, let us have faith to keep His (Jas. 1:21-25).