I love all of C.S. Lewis' books, this is probably #2 behind the Screwtape Letters which I have bought and given away many times and to which I return again and again to remind myself where pride and self-righteousness come from!

The command “Be ye prfect” is not idealistic gas. Nor is it a command to do the impossible. He said (in the Bible) that we were “gods” and he is going to make good his words. He will make us into a god or goddess, a dazzling, radiant, immortal creature…a bright stainless mirror which reflects back to God perfectly.