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  4. Andreas Vesalius
  5. I am not accustomed to saying anything with certainty after ...

I am not accustomed to saying anything with certainty after only one or two observations.

Andreas Vesalius
Science, Two, Scientific Method
Letter on the China Root, quoted in "Andreas Vesalius of Brussels, 1514-1564" by Charles Donald O'Malley, 1964.
I am not accustomed to saying anything with certainty after only one or two observations.