Song (Two Doves Upon The Selfsame Branch)

Two doves upon the selfsame branch,
  Two lilies on a single stem,
Two butterflies upon one flower:--
  O happy they who look on them.

Who look upon them hand in hand
  Flushed in the rosy summer light;
Who look upon them hand in hand
  And never give a thought to night.

--- Christina Rossetti  (1830 - 1894)  

(Although this poem is not specifically Christian, the poetess was)