It should be: 'He laughs best who laughs with some one else.' And that is what will make us strong in life, my love.

Some trying times may come, but we shall be brave.

We'll just look at each other, and laugh, because we shall understand.

We know.
We, somehow, comprehend together.

Don't you see?
Of course you do, because, if you didn't understand, what I am saying would be nonsense." She understood well enough.