Can 'it' as a pronoun refer to many different imperative verbs? For instance, in the sentence:
Abide by thy customs, thou excellent one: grind thy corn, drink thy water, praise thy cooking,-- if only it make thee glad!
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What that it is really referring back to is the single imperative verb that started the whole thing off: Abide. The other imperative verbs are just a list of example customs that you might be abiding by. You can leave them out without changing the meaning of the sentence:
Abide by thy customs, if only it make thee glad!
"It' is generally used to describe a single item, I think with the quote, that 'it' refers more to the single act of the customs rather than the three listed items.