I believe the author should have written something like this:
>
>
> However, no matter how deeply you try to think, your own wisdom and discretion is actually small.
* makes no sense in this context. There is only one person in the first place.
* There is no such compound or set phrase as . I think this is just a list of two words which have been somehow joined without any particle.
In reality, you need to deal with half-broken sentences like this, but this one is unsuitable for a test. If you were confused, it only means your Japanese is good enough, so you don't have to worry too much about this.