At one point in the debate, Copleston said, “Mr. Russell, you do believe in good and bad, don’t you?” Russell answered, “Yes, I do.” “How do you differentiate between them?” challenged Copleston. Russell shrugged his shoulders as he was wont to do in philosophical dead ends for him and said, “The same way I differentiate between yellow and blue.” Copleston graciously responded and said, “But Mr. Russell, you differentiate between yellow and blue by seeing, don’t you? How do you differentiate between good and bad?” Russell, with all of his genius still within reach, gave the most vapid answer he could have given: “On the basis of feeling – what else?” I must confess, Mr. Copleston was a kindlier gentleman than many others. The appropriate “logical kill” for the moment would have been, “Mr. Russell, in some cultures they love their neighbors; in other cultures they eat them, both on the basis of feeling. Do you have any preference?”
Ravi Zacharias, Can Man Live Without God? (Nashville, TN: Thomas Nelson, 1994), 182.