It is wonderful how much time good people spend fighting the devil. If they would only expend the same amount of energy loving their fellow men, the devil would die in his own tracks of ennui.

Fighting takes less energy than building

There's something almost comic about this observation, yet it cuts straight to how we actually live. We pour enormous energy into opposing things—battling what's wrong with people, systems, the world—while often neglecting the simpler work of actually building something good. Fighting creates momentum, gives us a clear enemy, makes us feel righteous. Loving someone, by contrast, feels quieter and requires sustained attention.

The insight isn't that we should ignore genuine harm or stop resisting injustice. It's that we're often lopsided in our effort. A parent can spend years lecturing a teenager about bad choices, or they can invest that same intensity in building real connection. A community can obsess over what's corrupt, or channel that passion into what could flourish. The devil—whether actual evil or just human dysfunction—thrives on the energy we give it, even negative energy.

What makes this unsettling is recognizing how much of our mental real estate gets occupied by opposition. It's exhausting to be perpetually against something. Keller's point suggests the antidote isn't better arguments or more forceful resistance, but a quiet redirect: toward what we love, toward people worth investing in, toward what actually deserves our time. Sometimes the most radical thing isn't fighting harder—it's investing elsewhere entirely.