Imagine you're teaching a class in which the students are less than enthusiastic (they've heard it all before). However, amongst them there is one, probably a relative beginner, who is all ears – fascinated and excited by everything you're saying and doing. Well, very quickly you will lose interest in the crowd (it's only natural) and will start directing your attention, and therefore the lesson, to the eager beaver. And maybe (just maybe) you'll find yourself going beyond the bounds of what you thought you knew. The listening student stimulates the teacher to teach. The listener stimulates the world, especially the natural world, to reveal its wonders. Everything needs a stimulus, if not a stimulant. It is our responsibility, our obligation to life and to God, to be stimulating – enthusiastic.