Smile,
Though your heart is aching
Smile,
Even though it's breaking,
When there are clouds in the sky, you'll get by
If you smile
Through your fears and sorrow, smile
And maybe tomorrow
You'll see the sun come shining through for you
Light up your face with gladness,
Hide ev'ry trace of sadness,
Altho' a tear may be ever so near,
That's the time you must keep on trying,
Smile,
What's the use of crying,
You'll find that life is still worhwhile,
If you just smile

Charles Chaplin
Para quem não sabe em inglês esta letra é linda.