“We all acquire two types of scars; one is visible for all to see and the other resides deep within us. Both possess pain but others can only determine if the external scars have healed. The emotional scars within are usually more painful and can linger for years.”
1983
Related quotes

“All of us heal in time. The strongest are born again. We only keep the scars we choose to keep.”
Source: Enchanted

“Scars are just a treasure map for pain you've buried too deep to remember.”
Source: Lone Wolf
Source: The Book of Joe (2005), 2014-January-15 http://books.google.co.uk/books/about/The_Book_of_Joe.html?id=_T5MCwAL4owC,

“The scars of others should teach us caution.”
Alius vulnus, nostra sit cautio.
Letter 54
Letters

Daniel
Song lyrics, Don't Shoot Me I'm Only the Piano Player (1973)