from which things some, having missed the mark, have turned aside to vain talking;

 (iii) His thinking comes from a pure heart. Here the word used is very significant. It is katharos ( G2513) , which originally simply meant clean as opposed to soiled or dirty. Later it came to have certain most suggestive uses. It was used of corn that has been winnowed and cleansed of all chaff. It was used of an army which had been purified of all cowardly and undisciplined soldiers until there was nothing left but first-class fighting men. It was used of something which was without any debasing admixture. So, then, a pure heart is a heart whose motives are absolutely pure and absolutely unmixed. In the heart of the Christian thinker there is no desire to show how clever he is, no desire to win a purely debating victory, no desire to show up the ignorance of his opponent. His only desire is to help and to illumine and to lead nearer to God. The Christian thinker is moved only by love of truth and love for men. 