John Lennon -- You gotta keep watering it.

John Lennon "Man of the Decade" Interview 1969

To work on this relationship with Yoko is very hard, and we've got the gift of love. But love is like a precious plant. You can't just accept it and leave it in the cupboard, or just think it's gonna get on with itself. You gotta keep watering it. You've got to really look after it, and be careful of it, and keep the flies off and see that it's alright, and nurture it.

That reminds me of "The little prince"
It’s the time you spent on your rose that makes your rose so important.People have forgotten this truth. But you mustn’t forgotten it. You become responsible forever for what you’ve tamed. You’re responsible for your rose.

Ça me rappelle "Le petit prince"
C’est le temps que tu as perdu pour ta rose qui fait ta rose si importante.Les hommes ont oublié cette vérité. Mais tu ne dois pas l’oublier. Tu deviens responsable pour toujours de ce que tu as apprivoisé. Tu es responsable de ta rose.