Hebrews 11:1
Now faith is the substance of things hoped for, the evidence of things not seen.
Faith starts with seeing what your eyes don’t yet see. Seeing what God believes about a thing is evidence (proof) of it’s reality. Faith doesn’t make something exists. Faith is proof that something already exists in the heavenly realm, and faith becomes the fiat for what already exists to manifest in the sight realm.
Faith is substance, and if you haven’t received what God believes as substance then you haven’t exercised faith. We live by faith and not by sight.