This text from the KhuddakaNikāya gives a clear statement regarding the dangers of dogmatism warning against comparing oneself with others and looking down on the doctrines of others. The text thus undermines the very foundation of intolerance.
A person who associates himself with certain views, considering them as best and making them supreme in the world, he says, because of that, that all other views are inferior; therefore he is not free from contention (with others). In what is seen, heard, cognized and in ritual observances performed, he sees a profit for himself. Just by laying hold of that view he regards every other view as worthless. Those skilled (in judgment) say that (a view becomes) a bond if, relying on it, one regards everything else as inferior. Therefore a bhikkhu should not depend on what is seen, heard or cognized, nor upon ritual observances. He should not present himself as equal to, nor imagine himself to be inferior, nor better than, another. Abandoning (the views) he had (previously) held and not taking up (another), he does not seek a support even in knowledge. Among those who dispute he is certainly not one to take sides. He does not [have] recourse to a view at all. In whom there is no inclination to either extreme, for becoming or non-becoming, here or in another existence, for him there does not exist a fixed viewpoint on investigating the doctrines assumed (by others). Concerning the seen, the heard and the cognized he does not form the least notion. That brahmana who does not grasp at a view, with what could he be identified in the world?
Khuddaka Nikāya, Sutta Nipāta, Sn 4.5 PTS: Sn 796-803