equilibrium

"... in their cool, sober moments of reflection; in the silence and solitude of the deep, during the long night-watches, when all their holy home associations were thronging round their hearts; in the spontaneous piety and devotion of the last hours of so long a voyage; in the fulness, and the frankness of their souls; when there was naught to jar the well-poised equilibrium of their judgment—under all these circumstances, at least nine-tenths of a crew of five hundred man-of-war's men resolved forever to turn their backs on the sea.  (White-Jacket, 1850)

"... those who suffer as little as they enjoy, have a calmness which may deceive. I prefer at times to disturb the philosopher's equilibrium, and to brave his fated reactions for the joy which for a moment sublimes both soul and sense."  (June 1852)