How are the setting in "best foot forward" and "back home" different?

Isaw my future flash before me and it did not take me anytime to slow down. i need to replace the words "it did".

Which generalization does the speaker make in the last stanza of to a louse? a) our main source of power comes from living blunder-free lives b) sometimes the best gifts come in the form of little creatures c) seeing ourselves as others see us would free us from blundering

If you receive an email then this doesn’t apply what does this mean?