For a long time the objects that mathematicians dealt with were mostly ill-defined; one believed one knew them, but one represented them with the senses and imagination; but one had but a rough picture and not a precise idea on which reasoning could take hold.
I'm for open-mindedness and tolerance. I'm against any form of fanaticism, fundamentalism or zealotry, and this certainty of 'We have the truth. ' The truth is far too large and complex. Nobody has the truth.