Matthew Henry: Faith is a firm persuasion and expectation that God will perform all that He has promised to us in Christ; and this persuasion is so strong that it gives the soul a kind of possession and present fruition of those things, gives them a subsistence in the soul by the firstfruits and foretastes of them; so that believers in the exercise of faith are filled with joy unspeakable and full of glory.
Now faith is the assurance of things hoped for, the conviction of things not seen. For by it the people of old received their commendation. By faith we understand that the universe was created by the word of God, so that what is seen was not made out of things that are visible.
By faith Abel offered to God a more acceptable sacrifice than Cain, through which he was commended as righteous, God commending him by accepting his gifts. And through his faith, though he died, he still speaks. By faith Enoch was taken up so that he should not see death, and he was not found, because God had taken him. Now before he was taken he was commended as having pleased God. And without faith it is impossible to please him, for whoever would draw near to God must believe that he exists and that he rewards those who seek him. By faith Noah, being warned by God concerning events as yet unseen, in reverent fear constructed an ark for the saving of his household. By this he condemned the world and became an heir of the righteousness that comes by faith.