Always listen to experts. They'll tell you what can't be done, and why. Then do it.

The line is a wry, contrarian maxim: expertise is valuable not only for guidance but also for mapping the boundaries of conventional thinking. “Experts” often define what is feasible according to current methods, incentives, and risk tolerance; the speaker advises hearing those limits clearly—then using them as a spur to attempt the supposedly impossible. The quote celebrates experimental boldness and individual agency, a theme strongly associated with Heinlein’s fiction and public persona: progress comes from people willing to challenge received wisdom. At the same time, it implies a pragmatic respect for knowledge—listen first—before choosing to defy it.