C.S. Lewis quote on making Excuses for our Faults

It seems, then, we are forced to believe in a real Right and Wrong...

First, that human beings, all over the earth, have this curious idea that they ought to behave in a certain way, and cannot really get rid of it. Secondly, that they do not in fact behave in that way. They know the Law of Nature; they break it. These two facts are the foundation of all clear thinking about ourselves and the universe we live in...

... The truth is, we believe in decency so much — we feel the Rule or Law pressing on us so — that we cannot bear to face the fact that we are breaking it, and consequently we try to shift the responsibility.

C.S. lewis
Mere Christianity, 21

thanks also to Dr. Norman Geisler

http://www.youtube.com/watch?v=r1Pyn910_Nk