Carlos Fuentes said this quote

Since I neither want not can influence the events of the world, my mission is to preserve the internal integrity and equilibrium of my mind; that will be in which the manor in which I recover the purity of the original act; I shall be my own citadel, and to it I shall retire to protect myself against a hostile and corrupt world. I shall be my own citadel and, within it, my own and only citizen.