That's Hebrews 11:1 from the Christian Bible. Can you explain what it means?
Is the first clause literally saying that faith is a substance? (Or is 'substance' being used metaphorically?)
Is the second clause literally saying that faith is evidence, allowing people to know things not otherwise knowable? That suggests that faith should be imagined as what Indian philosophy would call a pramana, a way (such as perception or logical inference) of acquiring true knowledge.
https://en.wikipedia.org/wiki/Pramana
I don't think that either interpretation (the metaphysical or the epistemological) works very well or makes much sense.
It probably makes most sense to interpret 'faith' psychologically, in the way that the Buddhists interpret 'sraddha'.
https://en.wikipedia.org/wiki/Faith_in_Buddhism
I think that many Christians do interpret 'faith' as 'trust' or 'confidence', as descriptive of their attitude towards whatever they are faithful about. (But not as a way of knowing things they wouldn't otherwise know.) I'm not sure if The God or the author of Hebrews were using the word that way.
I see faith as an aspect of God. The verse says that faith is the substance of all things hoped for. That is to say that God is the underlying, fundamental reality of everything, and we exercise that faith when we sincerely hope for something. Hope is the evidence of faith, and faith is the evidence of an underlying, fundamental, reality, which is invisible to the eye.
Now faith is the substance of things hoped for, and the evidence of things not seen.
jan.