Imagination
Poetry without imagination is the worst possible absurdity."Imagination is more important than knowledge."
  — Albert Einstein, On Science
Anatole France comes one step ahead and makes bold to say:
  — Albert Einstein, On Science
"To know is nothing at all; to imagine is everything."
Verily, Tagore, the Master-poet of modern India, was the emblem of an all-fulfilling imagination.
Sri Chinmoy, Rabindranath Tagore: the moon of Bengal’s Heart, Agni Press, 2011