Tiefe Brunnen muss man graben
Wenn man klares Wasser will
Rosenrot oh Rosenrot

from Rammstein – Rosenrot Lyrics on Rap Genius

Meaning

“Deep wells must be dug
If you want clear water
Rose-red, oh Rose-red”

If you add in the next line ‘Tiefe Wasser sind nicht still’/Deep waters don’t run still/Still water runs deep
It’s basically saying that not every person is what they seem and you need to dig deep to find out who they truly are.
This plays in with the Music Video for Rosenrot; in which a man falls in love with a young girl; only to be betrayed by her in the end.

To help improve the meaning of these lyrics, visit “Rosenrot” by Rammstein Lyrics and leave a comment on the lyrics box