178. OF all the means of communication, manual writing is the most simple, the most convenient, and the most complete. It is to that all efforts should tend, for it permits us to establish with the spirits as continuous and regular relations as among ourselves. We should cling to it the more, because it is that by which the spirits best reveal their nature, and the degree of their perfection or inferiority. By the ease with which they express themselves, they let us know their secret thoughts, and allow us, at the same time, to judge and appreciate them at their value. The faculty of writing, for a medium, is especially the one that is most susceptible of development by exercise.