Meaning of the word "fortune knocks at every man's door once in a life" in English

What does "fortune knocks at every man's door once in a life" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

fortune knocks at every man's door once in a life

US /ˈfɔːr.tʃən nɑːks æt ˈev.ri mænz dɔːr wʌns ɪn ə laɪf/
UK /ˈfɔː.tʃuːn nɒks æt ˈev.ri mænz dɔː wʌns ɪn ə laɪf/
"fortune knocks at every man's door once in a life" picture

Idiom

everyone will have at least one great opportunity in their lifetime

Example:
Don't be afraid to take this risk; remember that fortune knocks at every man's door once in a life.
He grabbed the chance immediately, believing that fortune knocks at every man's door once in a life.