Meaning of the word "self-praise is no recommendation" in English

What does "self-praise is no recommendation" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

self-praise is no recommendation

US /sɛlf preɪz ɪz noʊ ˌrɛkəmenˈdeɪʃən/
UK /sɛlf preɪz ɪz nəʊ ˌrekəmenˈdeɪʃən/
"self-praise is no recommendation" picture

Idiom

praising oneself or one's own achievements does not carry the same weight or credibility as being praised by others

Example:
He kept talking about his own genius, but self-praise is no recommendation.
I don't want to sound arrogant because I know self-praise is no recommendation.