All 8 Uses of

therefore
in
The Princess Bride

In any case, we cannot take the risk of his seeing us with the Princess, and therefore one of you must kill him.†
p. 118.5 *

therefore = for that reason

But I cannot find a weapon to match my peculiarities, and therefore I am deprived of reaching my highest skills.†
p. 126.9

But, again, you must have suspected I knew the origins of iocane, so you would have known I knew about the criminals and criminal behavior, and therefore I can clearly not choose the wine in front of me.†
p. 177.9

The man in black was very nervous now "But you also bested my Spaniard, which means you must have studied, because he studied many years for his excellence, and if you can study, you are clearly more than simply strong; you are aware of how mortal we all are, and you do not wish to die, so you would have kept the poison as far from yourself as possible; therefore I can clearly not choose the wine in front of me."†
p. 178.5

(a) I need to reach Count Rugen to at last avenge my father; (b) I cannot plan on how to reach Count Rugen; (c) Vizzini could have planned it for me but, (c prime) Vizzini is unavailable; however, the man in black outplanned Vizzini, so, therefore, the man in black can get me to Count Rugen.†
p. 276.5

(a) Prince Humperdinck had some plans to kill his fiancée and hired us to carry them out but (b) the man in black ruined Prince Humperdinck's plans; however, eventually, (c) Prince Humperdinck managed to capture the man in black, and, as everybody in all Florin City also knows, Prince Humperdinck has a terrible temper, so, therefore, (d) if a man has a terrible temper, what could be more fun than losing it against the very fellow who spoiled your plans to kill your fiancée?†
p. 276.8

Yes, absolutely, I would save him, if he had said 'true love,' but you misheard, whereas I, being an expert on the bellows cram, will tell you what any qualified tongue man will only be happy to verify—namely, that the f sound is the hardest for the corpse to master, and that it therefore comes out vuh, and what your friend said was 'to blove,' by which he meant, obviously, 'to bluff'—clearly he is either involved in a shady business deal or a card game and wishes to win, and that is certainly not reason enough for a miracle.†
p. 315.4

Definition:

for that reason (what follows is so because of what was just said)