“So long as these motives were habitual, and their attraction regular, the consequent result might, for convenience, be called movement of inertia, to distinguish it from movement caused by newer or higher attraction; but the greater the bulk to move, the greater must be the force to accelerate or deflect it. This seemed simple as running water; but simplicity is the most deceitful mistress that ever betrayed man.
For years the student and the professor had gone on complaining that minds were unequally inert. The inequalities amounted to contrasts. One class of minds responded only to habit; another only to novelty.”