The poem begins by rejecting an old argument: the idea that the world is like a watch, so intricate that it must have a maker behind it. Bonta's speaker flatly says life is no watchmaker, meaning it isn't a tidy, planned mechanism built by someone standing outside it.
What the speaker does instead is simply watch. The pun is neat: "watch" is both the object being dismissed and the verb of paying attention. By watching life work, the speaker is "made new," which suggests wonder and renewal rather than argument. Life isn't something to be explained like a machine; it's something that changes you when you notice it.
The last line, "o pen," is the surprise. Read as "open," it's split in two, so the word itself opens up on the page. It could also point to the pen, the writer's tool, as if watching leads to writing. The mood is quiet, light, and a little playful, with a sense of fresh attention and gratitude.