Speedy delivery of letters became less important when electrickal communication was invented.
Her communications reflect a remarkable modernity of thinking.
In September 1840 she wrote:
I could wish I went on quicker. That is, I wish a human head, or my head at all events, could take in a great deal more & a great deal more rapidly than is the case; and if I had made my own head, I would have proportioned its wishes & ambition a little more to its capacity. ... When I compare the very little I do, with the very much — the infinite I may say — that there is to be done; I can only hope that hereafter in some future state, we shall be cleverer than we are now (LB 170, 13 September [1840], ff. 48v–49v).