Twain_modesty
The Art of Manliness expands on an earlier post by providing the pocket notebooks of 20 famous men:

Twain kept 40-50 pocket notebooks over four decades of his life. He often began one before embarking on a trip. He filled the notebooks with observations of people he met, thoughts on religion and politics, drawings and sketches of what he saw on his travels, potential plots for books, and even ideas for inventions (he filed 3 patents during his lifetime). Many of his entries consist of the short, witty, pithy sentences he is famous for. He felt that if he did not write such things down as they came to his mind he would quickly forget them. He would also record little snippets in his notebooks of what had happened that day, such as what he had eaten and who he had seen. And finally, he wrote dirty jokes in the back of them.

(Image: A page from Twain's book.)

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