Is anything too hard for the Lord? (14). We need to hear these words as God’s call to greater faith. Sarah, like Abraham, had heard God’s promises, yet ‘she laughed to herself’ (12). We can hear God’s Word, and still remain, in our hearts, men and women of unbelief. The Word of God does not benefit us when we do not receive it with faith (Hebrews 4:2). God knows what is in our hearts, just as He knew what was in Sarah’s heart (13-15). He knows the human heart, ‘deceitful above all things’ (Jeremiah 17:9), yet He continues to love us. He does not give up on us. He perseveres with us. He could have given up on Sarah as a hopeless waste of His time, but He did not. ‘The evil heart of unbelief’ is always with us, but God is constantly at work to create in us ‘a clean heart’ ( Hebrews 3:12: Psalm 51:10). ‘Soften my heart, Lord’ (Mission Praise, 606).