"I should never have listened to her," he confided to me one day, "One should never listen to the flowers… — Antoine de Saint-Exupéry

"I should never have listened to her," he confided to me one day, "One should never listen to the flowers. One should simply look at them and breathe their fragrance."

In the original (French)

J'aurais dû ne pas l'écouter, me confia-t-il un jour, il ne faut jamais écouter les fleurs. Il faut les regarder et les respirer.

Source: Wikiquote · CC BY-SA 4.0