Smile, though your heart is aching.
Smile, even though it's breaking.
Though there are clouds in the sky, you get by...

If you smile through your fears and sorrows.
Smile and repeat tomorrow.
You'll see the sun come shining through.
[ Lyrics from: http://www.lyricsfreak.com/e/eric+clapton/smile_20051498.html ]
If you just light up your face with gladness,
Hide every trace of sadness.
Although a tear may be ever, ever so near.

That's the time you must keep on trying.
Smile, what's the use of crying?
You'll find life is still worthwhile
If you'll just smile, come on and smile.

If you just smile.