Half the noblest passages in poetry are truisms; but these truism are the great truths of humanity; and he is the true poet who draws them from their fountains in elemental purity, and gives us a drink.
Each of us carries about a great many 'truths' with which we are not only comfortable but which we consider sacrosanct. These 'truisms' can be things we learned at our parent's knee... idealities we have nurtured over the years... or prejudices we have hugged to ourselves over a period of time. More often than not, our personal convictions take precedence over antithetical arguments. This is why most people are not good listeners. They hear another person's thesis but simultaneously they form an argument to back their own belief. The result is that they really aren't listening. They are simply hearing. And they mentally counter what it is they choose to hear.