in Thoreau’s Journal:
I love very well this cloudy afternoon, so sober and favorable to reflection after so many bright ones. What if the clouds shut out the heavens, provided they concentrate my thoughts and make a more celestial heaven below!
I hear crickets plainer; I wander less in my thoughts, am less dissipated; am aware how shallow was the current of my thoughts before. Deep streams are dark, as if there were a cloud in the sky; shallow ones are bright and sparkling, reflecting the sun from their bottoms. The very wind on my cheek seems more fraught with meaning.