Robert Harris said this quote

....let me tell you that the one sin I have come to fear more than any other is certainty. Certainty is the great enemy of unity. Certainty is the deadly enemy of tolerance. Even Christ was not certain at the end........Our faith is a living thing precisely because it walks hand in hand with doubt. If there was only certainty, and if there was no doubt, there would be no mystery, and therefore no need for faith.

~ Robert Harris

And then to my surprise in one of them I discovered the original manuscript of On Friendship. Puzzled, I unrolled it, thinking I must have brought it with me by mistake. But when I saw that Cicero had copied out at the top of the roll in his shaking hand a quotation from the text, on the importance of having friends, I realised it was a parting gift: If a man ascended into heaven and gazed upon the whole workings of the universe and the beauty of the stars, the marvellous sight would give him no joy if he had to keep it to himself. And yet, if only there had been someone to describe the spectacle to, it would have filled him with delight. Nature abhors solitude.

~ Robert Harris

A ghost who has only a lay knowledge of the subject will be able to keep asking the same questions as the lay reader, and will therefore open up the potential readership of the book to a much wider audience.

~ Robert Harris

Social mores change all the time. In the mid-1970s, it would've been astonishing, say, to see two men holding hands in the streets. And the attitude to having a fling with a girl, or whatever, was quite different then.

~ Robert Harris