It means "Take all the time you need." or something like "Don't rush into things." "No need to hurry." "Let things come about slowly."
Or, as they say in Japanese, 急がば回れ (isogaba maware, 급할수록 돌아가라 from 급하다 to hurry, 수록 as or if) which means going the long way around is best if you're in a hurry (because it takes less time in the end) or as we say it in English "Haste makes waste." (급하게 낭비하다.) Now, if only I could learn Korean . . .