With a noun of feeling or action, a genitive can stand for the object of that feeling or action: reverentia tui "respect for you", cura rerum "care for things".
Ask who does what: in librorum … sitim the books are what is thirsted for, so "thirst for books", not "the books' thirst". Translate with "for", "of" or "towards": amor sui "love of self", inscitia boni "ignorance of the good".
For "of me, of you, of oneself" as an object, Latin uses mei, tui, sui, nostri, vestri: tui ipsius reverentiam "respect for yourself". The possessives meus, tuus, suus mean "my, your, his own".
Adjectives of fullness, sharing, knowledge and desire take the same genitive (plenus, particeps, expers, memor, cupidus, conscius), and so do memini and obliviscor: horum meminisse "to remember these things".