in Thoreau’s Journal:

Man is the artificer of his own happiness.  Let him beware how he complains of the disposition of circumstances, for it is his own disposition he blames.  If this is sour, or that rough, or the other steep, let him think if it be not his work.  If his look curdles all hearts, let him not complain of a sour reception; if he hobble in this gait, let him not grumble at the roughness of the way; if he is weak in the knees, let him not call on the hill steep. 

This was the pith of the inscription on the wall of the Swedish inn:  “You will find at Trolhate excellent bread, meat, and wine, provided you bring them with you.”