Robert Harris said this quote
“ 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. ”