“My mind is my weapon. My brother has his sword, King Robert has his warhammer, and I have my mind . . . and a mind needs books as a sword needs a whetstone if it is to keep its edge.”
―Tyrion to Jon Snow
Tyrion recognized from an early age that his mind was his greatest weapon, due to being born a member of House Lannister with the expectation of upholding his family's noble name, yet lacking the physical attributes possessed by his older siblings. Thus, he has committed himself to possessing a sharp intellect in order to help make up for his dwarfism, and he is frequently able to use his superior intellect to get the better of those who initially look down upon him or weasel his way out of tight situations, though he is not above resorting to using his family name and enormous fortune to bolster his position.
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