Rom. 4:20-22 Abraham never wavered in believing God's promise. In fact, his faith grew stronger, and in this he brought glory to God. He was absolutely convinced that God was able to do anything he promised. And because of Abraham's faith, God declared him to be righteous.
Abraham serves as an example of how a righteous man lives. He never wavered in believing God's promise. God had told Abraham that his descendants would be so many that they could not be counted and that they would inhabit the Promise Land. Abraham believed God explicitly. He knew that it would be so because God said it. End of story.We would do well to follow Abraham's example and simply believe what God has promised simply because God said it.
In fact, Abraham grew in his faith in what God had said. We read of some very severe testings of his faith, like the time he was commanded to take his only son from his wife, Sarah, Isaac, and offer him up as a sacrifice to the Lord. Abraham passed the test with flying colors and God provided a ram in place of Isaac. We would do well to follow Abraham's example and grow in our faith to the point where we would be willing to give our all to the Lord without reservation.
Abraham was absolutely convinced that God was able to do anything He promised. We say we believe God, but so often we don't live like we do. We believe with our lips, but struggle to believe with our feet. We need to be like Abraham and absolutely believe that God is able to do all that He has promised.
Abraham believed God without any reservations and he was considered to be righteous before God. We too are declared righteous when we believe and live like we truly do believe in God's promises and that He is able to fulfill them.