This is the translation of an Arabic proverb which means that during these hard times you miss someone who made life easier, happier, and so on:
In the darkest nights, the moon is dearly missed.
For example, it was first said when a just and kind Arab Leader was killed, and his people became hungry, oppressed, exiled, etc. with the tyranny that replaced it. So basically in these times of hardship and struggle, that man is dearly missed.
Are there any proverbs or saying or lines from poetry that are similar?