It is my perception, based on the way Prince Andrew came over in his interview on Newsnight, that he genuinely believes that if he remembers, or not, an instance, or a meeting, or a friendship, then what he perceives as the reality, is the reality, regardless of what simple facts may offer as contrary evidence.
I think that because it suits his situation to deny having met Ms Giuffre, and to deny his friendship with Ms Maxwell, then that is what he is offering as the truth, because he genuinely thinks that it is the truth.
I believe that were he to take a lie detector, he would pass, because the detector measures not what is true, but what the subject believes to be true - and he does.
The difficulty with that position, is that it involves ignoring factual evidence to the contrary, which is going to be brought out in court, should matters get that far.
My perception is that Prince Andrew genuinely does not think he has behaved either badly, or illegally, and that is why he is opting for a jury trial.
I think from his point of view, he believes he is absolutely right, beyond all reason, and that he will be proven as such, vindicated, and able to resume his life as a working royal.
I think that the reality may be somewhat different.
If the judgement is that he is not guilty of any crime under the law, the court of public opinion has already judged him, and he will carry the stigma of the accusations for the rest of his life.
We shall see where this goes, but I think the palace, and the Queen, must be worried at Andrew's obvious intention to fight to clear his name, which may be possible legally, but is looking increasingly unlikely from a public perception point of view.