Contract Law - Section 62: Aam Khao ya Dama Dam Mast Qalandar?

So, I was studying for my Contract Law exams and I just can't wrap my head around Section 62. Kya pata, it's like Papa always says, "Judge ko khush karna hai to yeh baat suno, Judge ko gussa aaya to yeh baat mat suno." Basically, it talks about when a contract is made by someone who doesn't have the authority to make it, and whether the other person (third party) knows about it or not.

It's written there that if the third party knew about the lack of authority, then the contract is still valid, but if they didn't know, then it's not valid. Lekin, what if the third party had a reason to know, but didn't?