Have in mind for your 250 word answer the following subjects: The Nymph does not believe in the sheperds love because she thinks his love is too fanciful. In every part we see the difference between the winter and the harsh way to be from the nymph and the springtime and love from the shepherd. we can contrast the skeptical point of view of the nimph with the warm offers of the shepherd. The main idea of this poem is that love and nature are beautiful but don't last forever.
The phrase "Blessed are the peacemakers" is among the beatitudes in the Bible, in the book of Matthew chapter 5 verse 9 which means that he that makes peace instead of war shall be blessed.
A ruler might want to include it in a coat of arms because he knows the importance of peace and wants to encourage the people to embrace peace instead of war.