It is always lovely to include a romantic poem on your invitations to hightlight your love for one another.  Here are a couple that we use all the time, when we are making invitations for our customers.

 ’ Together we have walked hand in hand, heart to heart we have shared with each other, one heart, one dream, one love and with love on our side we should never part.’  If space is an issue with your invitation it also sounds lovely if you finish it after ‘one love’

or

‘This day I will marry my best friend, the one I laugh with, live for, and love.’

Hope this helps