Analysis of How was it

Why ask, dear one? I think I cannot tell,
More than I know how clouds so sudden lift
From mountains, or how snowflakes float and drift,
Or springs leave hills. One secret and one spell
All true things have. No sunlight ever fell
With sound to bid flowers open. Still and swift
Come sweetest things on earth.
So comes true gift
Of Love, and so we know that it is well.
Sure tokens also, like the cloud, the snow,
And silent flowing of the mountain-springs,
The new gift of true loving always brings.
In clearer light, in purer paths, we go:
New currents of deep joy in common things
We find. These are the tokens, dear, we know!