Today's message is a powerful one regarding faith. Remember that Paul is writing this letter to discuss that one is given salvation through grace simply by believing in Jesus Christ - by having faith in God's love and His grace. One does not, and cannot, earn salvation by following the law as written in the first five books of the Bible as no one is flawless enough to follow the law perfectly.
In verse 16 Paul writes, "Therefore, the promise comes by faith, so that it may be by grace and may be guaranteed to all Abraham's offspring..." Paul explains that Abraham had pleased God through his faith alone (and Abraham lived before the law was given to Moses). We, too, are saved by faith. It is not by doing good deeds that we are saved, it is by faith in Christ. Having the faith to trust Jesus Christ to forgive our sins and grant us grace.
Let's take a look at the faith Abraham displayed. Abraham who was childless and almost 100 years old was given a promise by God that he would be the father of many nations. Abraham believed God and believed that God was powerful enough to do what He said. This is true faith. Faith is living in what God has said to you and not living only in what you can see. When God makes you or me a promise, God's word is a certainty. We do not need to get our calculator out or do high order mathematics to try to figure out how God is going to accomplish His promise. When God tells you something or makes you a promise it will be done. Our belief that it will be done, and our willingness to put that belief into practice, is faith.
Wishing you the best in your walk with Christ,