And the Moon in her fullness:
The astronomical Full Moon does not last a moment.
The moment the moon is full, she begins to decline,
and the moment she is in her “inter-lunar swoon”,
she begins her career anew as a growing New Moon.
So is man’s life here below. It is not fixed or
permanent, either in its physical phases, or even
more strikingly, in its finer phases, intellectual,
emotional, or spiritual.
Yusuf Ali, Abdullah. Translation and Commentary of the Quran. (surah 84 verse 18) Quran Arabic with English Translation & Commentary (Tafsir) by Abdullah Yusuf Ali, Free Download (quran4u.com)