Science and vision are not opposites or even at odds. They need each other. I sometimes hear other startup folks say something along the lines of: 'If entrepreneurship was a science then anyone could do it.' I'd like to point out that even science is a science and still very few people can do it let alone do it well.
We know that a man can read Goethe or Rilke in the evening that he can play Bach and Schubert and go to his day's work at Auschwitz in the morning.