I can say that the happiest period of my life has been since I emerged from the shadows and superstitions of the old theologies, relieved from all gloomy apprehensions of the future, satisfied that as my labors and capacities were limited to this sphere of action, I was responsible for nothing beyond my horizon, as I could neither understand nor change the condition of the unknown world. Giving ourselves, then, no trouble about the future, let us make the most of the present, and fill up our lives with earnest work here.