"Un sourire ne coûte rien, mais il rapporte beaucoup ; il enrichit celui qui le reçoit sans appauvrir celui qui le donne"



"When you're smilin'....keep on smilin'
The whole world smiles with you
And when you're laughin'....keep on laughin'
The sun comes shinin' through

But when you're cryin'.... you bring on the rain
So stop your frownin'....be happy again
Cause when you're smilin'....keep on smilin'
The whole world smiles with you

(instrumental break)
Oh when you're smilin'....keep on smilin'
The whole world smiles with you
Ah when you're laughin'....keep on laughin'
The sun comes shinin' through

Now when you're cryin'.... you bring on the rain
So stop that sighin'....be happy again
Cause when you're smilin'....just keep on smilin'
And the whole world gonna smile with

The great big world will smile with

The whole wide world will smile with you" (source)

Louis Armstrong, When your smiling