So I’m leaving you now, my children. Love each other always. That’s about the only thing in the world that matters: loving each other.

[ Je vais donc m’en aller, mes enfants. Aimez-vous bien toujours. Il n’y a guère autre chose que cela dans le monde: s’aimer.]

Victor Hugo (1802-1885) French writer

Les Misérables, Part 5 “Jean Valjean,” Book 9 “Supreme Shadow, Supreme Dawn,” ch. 5 (5.9.5) [Jean Valjean] (1862) [tr. Donougher (2013)]
    (Source)

Jean Valjean to Marius and Cosette, on his death bed.

(Source (French)). Alternate translations:

So I am going away, my children. Love each other dearly always. There is scarcely anything else in the world but that: to love one another.
[tr. Wilbour (1862)]

I am going away, my children. Love each other dearly and always. There is no other thing in the world but that; love one another.
[tr. Wraxall (1862)]

I am on the verge of departure, my children. Love each other well and always. There is nothing else but that in the world: love for each other.
[tr. Hapgood (1887)]

And now I must leave you, my children. Love one another always. There is nothing else that matters in this world except love.
[tr. Denny (1976)]

So I am going away, my children. Love each other dearly always. There is scarcely anything else in the world but that: to love one another.
[tr. Wilbour/Fahnestock/MacAfee (1987)]