A ray of light, to an oblique observer,
Remains invisible in pure dry air;
But shone into a turbid element
It throws distracting side-gleams everywhere

And is diminished by what takes the eye.
So poetry that moves by chance collision
Scatters its brightness at each random mote
And mars the lucid order of its vision.

The purest meditation will appear
Faint or invisible to those who glance
Obliquely at its unreflected beam;