In teaching a sixth form class recently it occurred to me that there must be a more gentle, perhaps more intuitive, approach to this result than is normally found in textbooks and that some Advanced level mathematics candidates really need a simpler approach. What follows is an account of one lesson. I make no claim to originality, for I find it hard to believe that others have not previously thought of such a simple introduction. However, other teachers did indicate that they had not seen this approach before.