I love this poem -- If you sometimes get frustrated or feel you may not be doing enough, all of you who do so much for animals, people, and nature, you may want to remember this:
Not in Vain
If I can stop one heart from breaking,
I shall not live in vain:
If I can ease one life the aching,
Or cool one pain,
Or help one fainting robin
Unto his nest again,
I shall not live in vain.
Emily Dickinson
