Final answer:
To marry Toula, it might be necessary for Ian to overcome substantial societal or legal obstacles as demonstrated by examples of Justinian and Theodora, and Iphis and Ianthe. These stories illustrate various drastic measures taken to ensure that a union can occur despite existing constraints.
Step-by-step explanation:
From the quotes provided, it appears that getting married to Toula involves overcoming obstacles and societal rules that may be preventing the marriage. In the instance of Justinian and Theodora, Justinian had to change existing laws because he as a senator could not marry a courtesan. Likewise, the situation with Iphis and Ianthe involves a transformation orchestrated by divine intervention, where Iphis undergoes a change from female to male to marry Ianthe. Both examples demonstrate that in order to marry within constraints of law or nature, significant actions or changes were undertaken to fulfil the promise of marriage.
Although specifics on Ian's situation aren't provided, these historical and mythical examples imply that one might need to navigate through legal, social, or even supernatural changes to be with the one they love. Therefore, if Ian were in a similar situation, he might have to consider making challenging decisions or changes to fulfill his intention to marry Toula, as suggested by the broader stories referenced.