What did martin luther describe as a mighty fortress and a bulwark that never fails?

what is the "did this mean" there is no picture. edit your question with a screenshot.

lancelot said to the beautiful ellen i c u r a b u t l n (i see you are a beauty lancelot was the greatest and worst of the knights who became the king's champion and undertook quests in the king's name. he became the adulterous lover of queen guinevere, and they had a son named galahad.