Good communication is as stimulating as black coffee, and just as hard.

The line hinges on a double comparison: truly “good communication” both energizes and unsettles. Like black coffee, it can sharpen attention, wake people up, and cut through foggy thinking; it is bracing rather than sweet. But it is also “hard” in two senses—difficult to produce (requiring clarity, honesty, and discipline) and difficult to take (because direct understanding can be bitter, demanding, or disruptive). The quote suggests that communication at its best is not mere pleasant talk; it is a rigorous exchange that can change moods, decisions, and relationships, precisely because it refuses easy comfort.