At Bible study today, on Romans, I was thinking about the nature of light, and of the Christian life.
C.S. Lewis, in his remarkable book “The Screwtape Letters”, writes about what he calls the law of Undulation (pgs 44-47). As he was a far better writer than I will ever be, I will quote:
“Humans are amphibians – half spirit and half animal…As spirits they belong to the eternal world, but as animals they inhabit time. This means that while their spirits can be directed to an eternal object, their bodies, passions, and imaginations are in continual change, for to be in time means to change. Their nearest approach to constancy, therefore, is undulation – the repeated return to a level from which they repeatedly fall back, a series of troughs and peaks…”
I took enough science to get a B.S. and learned some fascinating things about our world. Light is like a wave, and like a particle. It can be measured to exhibit both natures simultaneously (originally it was thought it was one or the other, new data shows otherwise). Also, when light enters another medium (refraction), it does not take the path one might expect; it takes the most efficient path to get to the place it is measured, almost as if there was a sentient foreknowledge of the future (any science nerds feel free to correct me, it’s been 10 years).
Today it occurred to me that the human experience of undulation is like light. We experience the particle, every moment in time, which can be seen over time as a wave with troughs and peaks. But, and this is important, our eternal destination is also always in view, so the the path that we take will go to the most “efficient” eternal end, as determined by God – the ultimate measurer and judge of men. What a comforting thought!