This depends a lot on what you mean by "revert".
If you want to temporarily go back to it, fool around, then come back to where you are, all you have to do is check out the desired commit:
# this will detach your HEAD, i.e. leave you with no branch checked out.
git checkout 0d1d7fc32
or if you want to make commits while you're there, go ahead and make a new branch while you're at it:
git checkout -b old-state 0d1d7fc32
If, on the other hand, you want to really get rid of everything you've done since then, there are two possibilities. One, if you haven't published any of these commits, simply reset: