Now faith is the assurance of things hoped for, the conviction of things not seen. Indeed, by faith our ancestors received approval. By faith we understand that the worlds were prepared by the word of God, so that what is seen was made from things that are not visible. By faith Abel offered to God a more acceptable sacrifice than Cain’s. Through this he received approval as righteous, God himself giving approval to his gifts; he died, but through his faith he still speaks. By faith Enoch was taken so that he did not experience death; and “he was not found, because God had taken him.” For it was attested before he was taken away that “he had pleased God.” And without faith it is impossible to please God, for whoever would approach him must believe that he exists and that he rewards those who seek him. By faith Noah, warned by God about events as yet unseen, respected the warning and built an ark to save his household; by this he condemned the world and became an heir to the righteousness that is in accordance with faith. By faith Abraham obeyed when he was called to set out for a place that he was to receive as an inheritance; and he set out, not knowing where he was going. By faith he stayed for a time in the land he had been promised, as in a foreign land, living in tents, as did Isaac and Jacob, who were heirs with him of the same promise. For he looked forward to the city that has foundations, whose architect and builder is God. By faith he received power of procreation, even though he was too old—and Sarah herself was barren—because he considered him faithful who had promised. Therefore from one person, and this one as good as dead, descendants were born, “as many as the stars of heaven and as the innumerable grains of sand by the seashore.” All of these died in faith without having received the promises, but from a distance they saw and greeted them. They confessed that they were strangers and foreigners on the earth, for people who speak in this way make it clear that they are seeking a homeland. If they had been thinking of the land that they had left behind, they would have had opportunity to return. But as it is, they desire a better country, that is, a heavenly one. Therefore God is not ashamed to be called their God; indeed, he has prepared a city for them. (Hebrews 11:1-16, NRSV)
Abraham was told his descendants would number more than the stars in the sky or the grains of sand on the seashore. And they got close to seeing the promise, but never saw it. They died before the promise came to be, but they did not look back to where they came from, they pressed forward, always keeping their eyes on God.
And that is faith! Believing something so strongly it makes you leave your home in the hopes of something better. Believing in something you can not see or know when it will happen, but following through on it because you believe it is true.
Faith is not hoping God can do something, it is knowing He will!