Wrong ius.
Even if the password is cryptographically strong, it doesn't mean that it can't actually allow you to predict his future passwords by the style of it.
For example, I have a specific method to remember passwords without storing it anywhere.

I know that my passwords would never be cracked within a millenium since it is base96+1 (alphanumeric+upper/lower case+symbols+foreign language characters) even in a Class F which is the highest level of cracking possible (1,000,000,000 Passwords/sec) normally possible with supercomputers and distributed cracking.

I know that my passwords are not in dictionaries.
But I am not a computer so I can't memorize random characters, therefore I use some heuristics and mnemonics to remember them.

If you saw my password, you could deduce from my style the rules I set for myself for all the passwords I am using on every single site and the future ones I'll generate.
You might not guess it right away, but you could tailor an attack for me, launching a statistical attack, or just making a password generating algorithm based on what type of rules I set up in my mind for new passwords.
It would considerably narrow down the possible passwords and accelerating considerably the cracking speed with a extremely higher degree of success.

Yes, it is security through obscurity, but this obscurity is in my brain, and as long as you don't have a mind reader the password will remain cryptographically secure.
(for the record, my password wasn't cracked, and I am also cracking it myself to test it out. I got more than 2000+ passwords cracked mine is still holding up pretty well and it should remain that way)

Therefore I totally agree with mewantsbitcoins, telling your password is stupid.
It can be really secure and be impossible to crack with current means, but knowing his mindset it might reveal everything.