Amen means so be it - when we agree with God’s Word (Jesus) concerning anything (meaning we believe it and receive it) God gets glory. He is the Yes, we’re the Amen - He already paid for it, we receive it and praise Him, He gets glory.
It’s not about denial or wishful thinking. It’s about confessing Christ into the situation. He even gave us the example to follow - When He was tempted in the wilderness, He resisted by quoting the Word.
He read His contract back to the landlord (god of this world) stating He did not have to do what he was being tempted with, because he understood his contract (the Word)