This poem from Clark Ashton Smith (CAS) was unpublished in his lifetime, and is not available on The Eldritch Dark, so here's the complete text:
Love is a rift of azure
Within the sombre ceiling of the storm.
Love is a rainbow,
Whereof one burning end is at our feet
And the other
Is lost amid the purple flowers and castles
And clouds of Faerie.
Love is a heaven
Where myrrh and cassia rise from summer lands
For an incense to the summer sun.
This is another item from a substantial body of minor love poems that CAS was writing in the late 1920's.