I think Rudyard Kipling's poem "If", does a fine job of explaining this.
It starts off with:
"IF you can keep your head when all about you
Are losing theirs and blaming it on you,"
"If you can fill the unforgiving minute
With sixty seconds' worth of distance run,
Yours is the Earth and everything that's in it,
And - which is more - you'll be a Man, my son!"
Basically, it tells us to keep calm and keep on doing the job you know needs to be done, whether that is building a railroad or nursing a child. It also tells us that effort and perseverance are important in achieving what you want.