Faith, according to Hebrews 11:1 is substantive and evidential in and of itself.
"Now faith is the substance of things hoped for, the evidence of things not seen."
Does that suggest that faith in anything proves the thing?
Yes and no.
Yes, faith, because of divine and universal principles set in motion from the time when God first created wisdom, dictates laws of belief and reality. No, because some things are real and other things are not. Truth is not relative, but it is dynamic.
There are realities that can be changed by our beliefs. Mountains can be moved. Circumstances can bend. Choices made in faith between a positive or negative outlook on the moment can change the meaning of the moment. Faith can change the individual who is doing the "faithing." Often that is enough to change the truth of the moment itself.
On the other hand, there are eternal truths and realities outside of our influence that simply are what they are and cannot be manipulated by our beliefs about them. God and His Word are constants in the universe and not even the universe and universal principles can alter them.
In the case of God and His Revelation, the only valid faith response is to conform, by faith to faith in Him and His will. It is unchanging and persistent and greater than our own realities or beliefs about them.
You may call it limits without limitations - the kind of freedom I give my 18 month old grandson when I define parameters within which he can wander at will and in which he feels absolute liberty to explore, express himself, and grow while enjoying, often without his own ability to understand, the safety of my watchful eye and protective gaze.
If he transgresses the limits into the realm of unknown dangers, I am there. As he grows older and more accountable for himself, he will venture forth into areas where I do not guide him. He will hit some walls and consequences which are real. Love compels me to let him grow and discover these for himself.
Even now, I must be willing to let him fall down on occasion. when he does, the ground below him does not move.
Grounding is real whether we believe in it or not.
The faith that the author of Hebrews addresses is faith founded on foundational fundamentals and in the person of Jesus Christ. With Him are infinite possibilities but also, unbending truths. "Faithing" is what we do when we embrace the reality of God's sovereignty and filter everything we believe through faith in Him. It becomes the substance of all that we embrace and the evidence of all we proclaim in spite of all other indicators to the contrary.
Ask me how I am. I am great. It doesn't matter how I feel in the moment. By faith I know, it is well with my soul.
Go move a mountain!