Parallel structure means using the same pattern of words to show that two or more words or ideas are of equal importance and to help the reader comprehend what is being written. It is grammatically correct to ensure that phrases, clauses and items on a list after a colon<span> use the correct parallel structure. </span>
The answer is: you.
Reflexive pronouns like <em>yourself</em> are used when the subject and the object of the verb are the same person or thing. The antecedent is the person or thing that the reflexive pronoun refers to, which is usually mentioned before.
In the example sentence, the reflexive pronoun is <em>yourself,</em> which means that the antecedent is <em>you:</em>
I do not believe what <u>you </u>did to <u>yourself </u>is for the best.
Sirens are others
Charybdis is goddess
Athena goddess
poseidon is gods
cicones human
Tiresias other
Argos other