"If you can dream---and not make dreams your master;
If you can think---and not make thoughts your aim,"
"If you can dream---and not make dreams your master;
Dream, but don't let the dream be your master. i.e Don't let your dreams control you.
If you can think---and not make thoughts your aim,
We get thousands of thoughts. But we can't take up all our thoughts as our aim. Most of our thought, will lead to destruction, as it's in our human gene."
If all men count with you, but none too much:
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!