When you have exhausted all possibilities, remember this - you haven't.

The line expresses a characteristically “Edisonian” ethic of persistence: the feeling of having tried everything is usually a sign that one’s imagination, methods, or assumptions have narrowed, not that reality has been fully explored. It reframes exhaustion as a cognitive limit rather than an objective endpoint, urging renewed experimentation and a willingness to revisit constraints. In quotation culture it is often linked to Edison’s long, iterative approach to invention (notably the light bulb), though the sentiment is broader than any single episode: progress comes from continuing to test, vary, and recombine ideas after apparent failure.