Meaning of the word "the morning sun never lasts a day" in English

What does "the morning sun never lasts a day" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

the morning sun never lasts a day

US /ðə ˈmɔːrnɪŋ sʌn ˈnɛvər læsts ə deɪ/
UK /ðə ˈmɔːnɪŋ sʌn ˈnɛvə lɑːsts ə deɪ/
"the morning sun never lasts a day" picture

Idiom

a proverb meaning that good things or intense emotions are often temporary and do not last forever

Example:
They were so in love, but the morning sun never lasts a day.
Enjoy this success while it lasts, for the morning sun never lasts a day.