Hebrews 11:1

Here we have, I. A definition or description of the grace of faith in two parts. 1. It is the substance of things hoped for. Faith and hope go together; and the same things that are the object of our hope are the object of our faith. It 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 first-fruits and foretastes of them: so that believers in the exercise of faith are filled with joy unspeakable and full of glory. Christ dwells in the soul by faith, and the soul is filled with the fullness of God, as far as his present measure will admit; he experiences a substantial reality in the objects of faith. 2. It is the evidence of things not seen. Faith demonstrates to the eye of the mind the reality of those things that cannot be discerned by the eye of the body. Faith is the firm assent of the soul to the divine revelation and every part of it, and sets to its seal that God is true.

— Matthew Henry's Concise Commentary (public domain)