A neat little story I've heard a couple of times. Pretty inspirtational.

An old man was picking up objects off the beach and tossing them out into the sea. A young man approached him and saw that the objects were starfish. "Why in the world are you throwing starfish into the water?" he asked.
"If the starfish are still on the beach when the tide goes out and the sun rises high in the sky, they will die," replied the old man.
"That is ridiculous," retorted the young man sceptically. "There are thousands of miles of beach and millions of starfish. You can't really believe that what you're doing could possibly make a difference!"
The wise old man picked up another starfish, tossed it out into the waves, and said thoughtfully,
"It made a difference to that one."

We can do no great things, only small things with great love. ~Mother Teresa