Dear Deborah,
You ask a *very deep question.  Does everything we do matter?  Yes.

Your second question: What do you we do with the enormity of this responsibility?
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#1 - Think of impact before taking action.
A simple quick pause where you picture those in your work or life provides instant perspective.

#2 - Own what you do.  None of us is perfect.  Being accountable for our actions can actually start the reversal of negative impact.

#3 - Learn how to sincerely apologize.  Here's one of my posts that has helped many with this
http://katenasser.com/the-perfect-apology-the-one-word-that-destroys-it/

#4 - Get up in the morning and set an intention to have a positive impact on others not a negative one.  The mind is very powerful.  It can change what we say and do.

I love your post and I think it would make a great #leadfromwithin chat topic on Twitter.  If you want to submit it there, get in touch with http://twitter.com/lollydaskal.

Many thanks for this post.
Kate