I’ve begun, from time to time, to respond to various ideas that I think are prime examples of sloppy thinking. The following is a quote from Scottish inventor, Sir James Dewar:
The problem with a mind that is always open is that it never reaches any conclusions or establishes any convictions.
The minds that function best are those whose owners have asked crucial questions, gained knowledge and reached understanding. They have insight and wisdom.
With a well established, comprehensive, cohesive belief system, there are then a number of ideas and concepts and propositions that come along to which they are no longer open; and a variety of pronouncements and proposals will be summarily and thoughtfully rejected.
I much prefer the thinking of John Jay Chapman, an American essayist and social commentator:
In making up one’s mind, one closes one’s mind.
Or G. K. Chesterton, English author and critic:
The object of opening the mind, as of opening the mouth, is to shut it again on something solid.