a magician never reveals his secrets
Meaning
A polite refusal by someone who has just done a magic trick to reveal how it works.
(by extension) A refusal to explain how one accomplished something impressive.
Source: en.wiktionary.orgA polite refusal by someone who has just done a magic trick to reveal how it works.
(by extension) A refusal to explain how one accomplished something impressive.
Source: en.wiktionary.org