If there is no God, what does it mean to be human? Who are we in our essence? If we don’t know what it is to be human, what is humanism? There are seven different humanistic theories of who we are, from the one end of Huxley to Ayn Rand to Joseph Fletcher. You just have all of these various definitions from ego-centric humanism to love is the ethic; on what basis? So we are now standing with our feet planted firmly in mid-air. I would say, while theoretically a person may block God out, logically there will be a breakdown because ultimately all enunciation implies a moral doctrine of some kind. And if that moral doctrine is not absolute then the definer himself becomes undefined. That’s what we are living with – an undefined definer giving us definitions for our course, and we are being trapped in the quicksand of the absence of objective truth.
— Ravi Zacharias