Why might people in the past have been hesitant to embrace the idea of progress? The main argument against it was that it implies a disrespect of previous generations. As the historian Carl Becker noted in a classic work written in the early 1930s, “a Philosopher could not grasp the modern idea of progress … until he was willing to abandon ancestor worship, until he analyzed away his inferiority complex toward the past, and realized that his own generation was superior to any yet known.”