What is the poem "If You Love for the Sake of Beauty" by Friedrich Ruckert all about?

The poem is easily laid out as a set of
logical/emotional propositions, and readers enjoy discussing the nature of the
relationship between the speaker and the listener, and also discussing the various
reasons for which people join together in love relationships and marriage. The poem’s
hypothetical situation is that the speaker is addressing a lover or suitor who has been
offering reasons for loving the speaker. Lines 2, 4, and 6 present images of bright
golden hair, the rebirth of spring, and rich and clear pearls. The speaker uses these
images to point out her or his limitations, for she or he could never sustain the
listener’s love for reasons of beauty, youth, and wealth in lines 1, 3, and 5. The final
two lines, particularly the last, climax the previous six because the speaker settles on
love alone as the cause of loving, not the previous causes, which have been rejected.