What they undertook to do
They brought to pass;
All things hang like a drop of dew
Upon a blade of grass.

The lines juxtapose human resolve with the fragility and contingency of existence. “What they undertook to do / They brought to pass” celebrates purposeful action—people who commit themselves and succeed. Yet the next image abruptly scales that confidence down: “All things hang like a drop of dew / Upon a blade of grass.” The world’s outcomes, even those achieved through will, remain precarious—dependent on slight supports and vulnerable to disappearance. The dew-drop metaphor suggests transience (it will evaporate) and delicacy (it can fall with a tremor), implying that achievement and reality itself are both real and radically unstable. The effect is a Yeatsian tension between heroic making and the evanescence of all things.