The Rule of St. Benedict - Chapter 68. Assignment Of Impossible Tasks To A Brother

(1) A brother may be assigned a burdensome task or something he cannot do. If so, he should, with complete gentleness and obedience, accept the order given him.
(2) Should he see, however that the weight of the burden is altogether too much for his strength, then he should choose the appropriate moment and explain patiently to his superior the reasons why he cannot perform the task.
(3) This he ought to do without pride, obstinacy or refusal.
(4) If after the explanation the superior is still determined to hold to his original order, then the junior must recognize that this is best for him.
(5) Trusting in God's help, he must in love obey.

中文請參：http://stbenedictineoblatestw.blogspot.com/2009/04/1-2-3-4-5_26.html