A proverbial/poetic expression similar to 'love is blind', suggesting love can cloud judgement.
歌詞の一節に『恋は闇』とあって、その意味を考えさせられた。
There was the line '恋は闇' in the lyrics, which made me think about its meaning.
古いことわざの一つに『恋は闇』と表現されるものがある。
There is an old proverb that expresses it as '恋は闇'.