You might look at Twain's notebooks which can be most revealing of his feelings not hidden behind a satrical veil. In fact I can dimly recall a passage or two but my copies of his notebooks are at my office and I will not be back there the remainder of the week. However, I did find in his autobiography a passage that is similar to what I remember reading in his diaries. After describing the death of his dearest daughter in Chapter 71 Clemens writes: "She was the most beautiful spirit, and the highest and the noblest I have known. And now she is dead." Knowing Twain's love for his family and the pain he suffered from their deaths I have always found this passage moving. His simple yet elegant description of her spirit followed by "she is dead" is a juxtaposition of Samuel Clemens the writer and Mark Twain the man embittered by life's circumstances and humanities cruelty.