The four 'noble usage's', are: contentedness
(of the monk) with any robe, contentedness with any alms-food, contentedness
with any dwelling, and delight in meditation and detachment. In the Ariya-vamsa
Sutta, (A. IV , 28) and similarly in D. 33, it is said :
"Now the monk is contented with any robe, with any alms-food,
with any dwelling, finds pleasure and enjoyment in mental training and
detachment . But neither is he haughty on that account, nor does he look down
upon others. Now, of a monk who herein is fit and indefatigable, who remains
clearly conscious and mindful, of such a monk it is said that he is firmly
established in the ancient, noble usage's known as the most lofty ones."
Full tr. of Ariya-vamsa Sutta in WHEEL 83/84.