Text: We seem to believe that all human action is motivated not by the desire to know or improve the lot of humankind, but only by the basest motives of greed, power, and self-aggrandizement.
Entailment: All human action is not motivated by desire to know or improve mankind, instead it is the driven by base motives.
Contradiction: All human action is motivated by desire to know or improve mankind, it is not driven by base motives.