A philosophy professor began each new term by asking his students, “Do you believe we can show that there are absolute values like justice?” The free-thinking students all said no. Everything is relative, they argued, and no single principle or law applies to everyone everywhere.
Before the semester was over, the professor devoted one class period to debate the issue. At the end, he concluded by saying “Regardless of what you think, I want you to know that absolute values can be demonstrated. And if you don’t accept what I say, I’ll flunk you!”
Immediately one angry student got up and walked out. As he went, he said, “That’s not fair!” Unwittingly he had just proven the professor’s point. He had appealed to a higher standard—the standard of fairness.
Imagine a person who . . . argues ‘no air exists’ but continues to breathe air while he argues. Now intellectually, atheists continue to breathe — they continue to use reason and draw scientific conclusions [which assumes an orderly universe], to make moral judgments [which assumes absolute values] — but the atheistic view of things would in theory make such ‘breathing’ impossible. They are breathing God’s air all the time they are arguing against him.
―Greg L. Bahnsen