The Weakness Riddle

TK. I know your weakness
TI. yeah, where’s it at?
TK. And why would I tell you; aren’t you my enemy?
TI. That’s not true.
TK. But, if you’re my enemy couldn’t you be lying?
TI. I guess that’s true.
TK.There you go again: I’m uncertain of the truth value of your linguistics.
TI.So, how do I know you aren’t bluffing?
TK. You don’t but I can tell you a little bit:

Your weakness is unknown to you;
and that is precisely why it makes you so weak.
Because it is the part of you;
the part that you are unaware of,
which is why it has the power to topple you.