Thomas E Lawrence once said that, "All men dream, but not equally. Those who dream by night in the dusty recesses of their minds, wake in the day to find that it was vanity: but the dreamers of the day are dangerous men, for they may act on their dreams with open eyes, to make them possible."
The dreams and goals that we have need to be the dreams that are with our eyes open. We need to have these dreams firmly set in our minds to not deceive us or tempt us into believing we are greater than we actually are. No, these dreams are set to make us live out our lives achieving the things that we set out to do.

Ignorance is said to be bliss, but being deceived from the truth to believe the dreams with your eyes shut is a total lie.
Dreams and goals are what we have in our lives to put a marker against our achievements as men. If we have a distorted dream, then we will never truly reach our potential of what we were called to do. But if we are "dangerous men" with our eyes open, then it is said, "the world is your oyster". Ultimately, to be a dangerous man we need to truly believe that our open eyes are not deceiving us like our shut ones. We need to believe in ourselves, knowing that nothing in this world can damage those dreams. We need to believe that what we have to say is as important as anyone else's words in the world. We need to break down those barriers of insecurity from those aiming to defy us in achieving these "open eyed" dreams.
We need to dream modestly, humbly and nobly to understand the full nature of the dreams and goals we have in our lives, for if we do this, then we can become dangerous men, and with our eyes open, we can make those dreams possible!