Questions & Answers about Itaque magnum interest utrum pueri gloriam solam quaerant an veram dignitatem cum industria et parcimonia.
Interest is an impersonal verb here: it means it matters or it makes a great difference.
The word magnum adds strength: it matters greatly or it is very important.
Grammatically, magnum is a neuter accusative singular used adverbially with interest. This is a regular Latin idiom. So:
- interest = it matters
- magnum interest = it matters greatly
Because interest is impersonal. The real idea is it matters, not the boys matter.
The plural noun pueri is the subject of quaerant, not of interest.
So the structure is:
- it matters greatly
- whether the boys seek...