desire with the right attitude bro...when we fail to get that desire..we are faced with 2 options...
to stop and get frustrated or to continue and run the race...
if there is no desire then there will no race in the first place...
the concept of taking out "I" for it is ego and "want" for it is desire...
that is an idiom bro and not to be taken literally

it would rather mean to Have the right desire(not a selfish one) packed with hope and humility(in the sense that everything is possible and not within our control)...though the risk of failing is there but in failures we learn
and how a person would react to that failure mirrors to what kind of desire(egoistic or not) was there to begin with.
you said the goal is to attain true happiness...
how can a goal exist if there was no desire in the dirst place?
