in Thoreau’s Journal:

A comfortable breeze blowing. Methinks I can write better in the afternoon, for the novelty of it— if I should go abroad this morning— My genius makes distinctions which my understanding cannot— and which my senses do not report. If I should reverse the usual— go forth & saunter in the fields all the forenoon then sit down in my chamber in the afternoon, which it is so unusual for me to do—it would be like a new season to me & the novelty of it inspire me. The wind has fairly blown me out doors—the elements were so lively & active— & I so sympathized with them that I could not sit while the wind went by. And I am reminded that we should especially improve the summer to live out of doors— When we may so easily it behoves us to break up this custom of sitting in the house. for it is but a custom—and I am not sure that it has the sanction of common sense. A man no sooner gets up than he sits down again….Is the literary man to live always or chiefly sitting in a chamber—through which Nature enters by a window only? What is the use of the summer?

….but here outdoors is the place to store up influences.