Edward Everett Hale - I am only one, 
 But still I am one.
...

A quote found at theysaidso.com

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.

Edward Everett Hale

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