Starswirl: You two are the only alicorns right now  Everything alicorns stand for everything equestria was founded upon, love harmony and friendship. Because alicorns are a combination of pegasi, unicorn and earth pony.  You two can represent equestria in an unbiased manner. Showing   ponies to love each other equally all over equestria .

Starswirl: Yes you will serve and protect equestrias lands and skies and keep them safe.