6 I beg that you will not silently in your mind accuse me either of vanity or of insincerity. God bears me witness in my conscience that the unavoidable circumstances mentioned above drew me back when I was just going to grapple with my commentary; and you know that what is done when the mind is pre-occupied is never well done. I gladly accept the cap that you have sent me, a mark, though small, of no small affection and just the thing to keep an old man's head warm. I am delighted alike with the gift and with the giver.
Source: Letters (New Advent)