Can anyone tell me the poem and the poet that used the phrase, "splendor in the grass"?

What though the radiance which was once so bright

Be now for ever taken from my sight,

Though nothing can bring back the hour

Of splendor in the grass, of glory in the flower

We will grieve not, rather find

Strength in what remains behind;

In the primal sympathy

Which having been must ever be;

In the soothing thoughts that spring

Out of human suffering;

In the faith that looks through death,

In years that bring the philosophic mind.

William Wordsworth 1770 - 1850