The fanatics, the extremists, the exclusivists, and the intolerant never find truth. This is in part because they persistently reject the pole which opposes the one on which they have taken their stand. They refuse to see that it is needed to do justice, to complete the picture, and to explain the tension between both. It is needed to give a deeper and clearer view of their own experience. This is why philosophy teaches the need and value of achieving balance between opposites.
-- Notebooks Category 20: What Is Philosophy? > Chapter 3: Its Requirements > # 291