If history and science have taught us anything, it is that passion and desire are not the same as truth.

The line draws a sharp boundary between what people want to be true and what can be supported by evidence. By invoking both “history” and “science,” it suggests that repeated human experience—ideological movements, moral panics, utopian schemes, and even well-intentioned reforms—shows how easily fervor can override reality-testing. Read in the spirit of Wilson’s broader defense of scientific inquiry, it functions as a caution against letting conviction substitute for verification. The quote also implies an ethical stance: because desire can be sincere yet mistaken, claims about the world should be disciplined by methods that check bias (observation, experiment, and critical scrutiny) rather than by intensity of feeling.