From this I learn that we need to be aware of our actions that take on a life of their own. Not everything we do vanishes after it is done. Some things carry on, persist, infect and affect others.
Still, we have no choice but to continue to act and do and live. These necesitates two things, great Yirat Shamayim, and also great Emunah. We have to have faith in HaShem always that He is guiding us to good things, and protecting us from what we can't and don't know. (Similar to what the Nodah b'Yehudah said in the story about him found on A Simple Jew)