the binding of isaac is an incredibly detail oriented game when it's looked at closely. while a lot of observations about isaac could simply be gleamed from the game's endings, it is the items and interactions in the game that showcase the true complexities of his character - one of these interactions being the fortune teller machines (or more accurately the "fortunes" they provide). these fortunes are indicative of things that isaac considers good, real, or otherwise truthful remarks, and reflect things that he's been told in his real life.
the fortunes themselves are presented as instructions or insights to the reader, and are often cynical or downright hurtful in nature, though not necessarily presented as such. they're shown just the same as other generally kinder remarks - fortunes like "BLAME NOBODY BUT YOURSELF" and "YOU WERE BORN WRONG" exist alongside fortunes like "YOU MAKE MISTAKES IT IS ONLY NATURAL" and "BELIEVE IN YOURSELF". this lack of distinction between these wildly different perspectives displays the kind of information he gets about himself, likely mostly coming from the two biggest sources of information in his life - his mother and father. isaac sees both perspectives as completely valid, because they're both people he was raised to trust, and isaac himself is still too young to really question their remarks towards them, even if they seem paradoxical. isaac also seems to take great importance in the sources his mother provides through her christianity, such as television or literature. the fortunes that are biblical (and often crueler) in nature likely come from there.
in a similar vein, many of the fortunes contradict themselves on their own advice - "WAKE UP" and "STAY ASLEEP", "GO OUTSIDE" and "DON'T LEAVE THE HOUSE TODAY", "MARRY AND REPRODUCE" and "QUESTION AUTHORITY". these fortunes and their simultaneous existence, while also showing the kinds of contradicting information he receives, could also portray a frustration or confusion with the statements themselves. he feels as though it is all true, but he can't possibly fulfill it all without compromising some part of what he was brought up with. it reflects a central theme of the binding of isaac - isaac's struggle with morality, with trying to understand what is the "right" thing for him to do, or if he is even "right" in the first place.
isaac struggling to see himself as "right" likely comes from many of these comments being more self deprecating than they are kind. considering their portrayal as just as accurate and true as any other fortune, remarks like "YOU LOOK FAT YOU SHOULD EXERCISE MORE" and "YOU WILL NEVER BE FORGIVEN" are taken at face value, and their depiction in game displays the way isaac sees himself and how the way people around him describe him is taken to heart. he sees himself as a monster, and it seeps down into every part of his being.
there are also fortunes that break away from the game itself and express isaac's vague awareness of the current state he's in. a lot of them refer to his own death or sleeping (one even refers to steven - which i intend to elaborate on later), and the only fortune that is a referral to isaac himself is "I FEEL ASLEEP!!!" *. its existence as the only fortune that actually talks about himself is yet another example of the small moments in which the binding of isaac's facade slips and he can, briefly, see his own fate.
some of these fortunes aren't always completely isaac's own thoughts, of course. there are quite a few fortunes that are meta in nature, like "REBIRTH GOT CANCELLED", "WELL THAT WAS WORTHLESS", and "WHEN LIFE GIVES YOU LEMONS REROLL!", and these obviously aren't always indicative of his own thoughts or views on his life. by and large, however, these fortunes are signs of the way isaac sees himself and the things he's been told from their contradictory, personalized nature, and their imperative structure with a second-person perspective.
* i realize that this is likely a reference to metal gear solid. i still feel like the way it is written fits within the context of the game / character and can be analyzed as such without a simple meta dismissal as some other similar references.












