Thoreau writes in his journal:
It is never enough that our life is an easy one. We must live on the stretch; not be satisfied with a tame and undisturbed round of weeks and days, but retire to our rest like soldiers on the eve of a battle, looking forward with ardor to the strenuous sortie of the morrow. “Sit not down in the popular seats and common level of virtues, but endeavor to make them heroical. Offer not only peace offerings but holocausts unto God.” To the brave soldier the rust and leisure of peace are harder than the fatigues of war. As our bodies court physical encounters, and languish in the mild and even climate of the tropics, so our souls thrive best on unrest and discontent. He enjoys true leisure who has time to improve his soul’s estate.
