Heaven in the Mind

If I were to compare heaven
To a thing of earth,
Impossible as moving stars
Or all the planets directing
Their different paths
In effluence through space.

Oh what, oh what should my mind, aching,
Use to describe this theme.
To compare it to the blue sky
Or perhaps the green of a spring tree.
But I feel it more real
To compare it to
Your vast, vast love for me.