There is a great quote, variously attributed to Edward Everett Hale and also to Helen Keller. Probably was first said by Hale, given that he lived earlier. Can't blame Ms. Keller for using it, as she accomplished much, despite being blind and deaf.
"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."
It is a great concept!
Hale also had his thoughts about those who complain too much, "Never bear more than one kind of trouble at a time. Some people bear three - all they have had, all they have now, and all they expect to have."
And, one more from Hale, just because we should all feel this way, "Even with all my wrinkles! I am beautiful!"
