Why do they say still waters run deep?

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Tags

1. #still
2. #nature
3. #warning
4. #idiom
5. #originally
6. #silent
7. #means
8. #lives
9. #people
10. #internal
11. #exterior
12. #originated
13. #dangerous
14. #english
15. #waters
16. #passionate
17. #latin
18. #proverb
19. #manner