Translation is not necessarily close to the original

There is a Cervantes quote in Don Quixote
"'[A]s Sancho says, silence is golden.'
'That must be some other Sancho,' said Don Quijote." Volume 2, Chapter 43, pg. 584

This is the speech of the translator thus cannot be dated to the time of Cervantes but to the the time of the translation. A different translation says:

'sage silence is called Sancho.'"
"That, Sancho, thou art not," said Don Quixote;