I came across this little poem by Edward Everett Hale (1822-1909).  It pierced all the way to my inner core.  Am I doing all I can or only what I think I can?

I am only one, but still I am one. 

I cannot do everything, but still I can do something;

And because I cannot do everything I will not refuse to do the something that I can do.

Click on this image to hear and watch “What If I Give All”.