One can take a brief rest in the shade; such a task can be accomplished very quickly, in a snap.

This couplet reminds us of the simple joy of taking a quick break, perhaps finding a moment of rest in the shade. It beautifully contrasts this with the idea that some tasks are incredibly simple and can be completed 'in a snap' or 'in the blink of an eye.' It encourages us to appreciate both the small pauses we take and the ease with which certain jobs can be accomplished. So, whether it's a short rest or a swift task, both have their own simple beauty and can bring a sense of ease to our day.