When we can't dream any longer we die. That cannot fly. You must never stop dreaming. Face reality, yes. Dream of peace.
Peace is rational and reasonable.
War is irrational in this age and unwinnable. It may be that those who do most, dream most. Is but a dream within a dream. Poe They who dream by day are cognizant of many things which escape those who dream only by night. The thing you have to be prepared for is that other people don't always dream your dream.