Because if you are beaten down, if you have worked as hard as you can, if you have done everything you said you should, and it still doesn't work out, fatigue can sap you of your energy.
Porque, se estamos acabados, trabalhamos o quanto pudemos, fizemos tudo o que dissemos que deveríamos fazer, e as coisas ainda não dão certo, a fadiga pode esgotar nossa energia.