Answer: The couplet allows for parallel form connecting the elements of thought.
Here are the connections:
God directs - from his head
guard him from on high- let ev'ry evil fly
Use an apostrophe + S ('s) to show that one person/thing owns or is a member of something. ...
Use an apostrophe after the "s" at the end of a plural noun to show possession. ...
If a plural noun doesn't end in "s," add an apostrophe + "s" to create the possessive form.
Most accepted determination of whether a piece of information is widely known, particularly if the 'people' concerned are your peers such as fellow students in a class.