What is knowledge? [Letter]

Dear [redacted], You asked me a very fascinating question earlier. You asked me how to learn -- learning is something I deeply care about and it gave me incredible pleasure to give you an answer, to the best of my ability. I love numbers, sets of things, their ennumerability and…

Happy birthday Vince.

Happy birthday Vincent! I hope you liked those cuff links after all. London, 30 March 1874 Dear Theo, I have received your gift, included in a letter to me, of a guilder intended for the purchase of a pair of cuff links. I thank you very cordially, old man, but…