It is much more productive to jump from a Sartre to a Swedenborg, to close the Bible and open the Upanishads, to move from history to metaphysics, than to gorge oneself on the same food, restricting the horizon of the intellect and depriving it of immersion in different subjects, values, and styles. Oscillating between extremes, searching for the valuable in everything, and absorbing as much of it as possible: with this technique, even the most renitent brain is forced to evolve.