Adverbial Uses of the Accusative
With interest and refert the degree of interest is expressed by an adverbial accusative.
Plurimum refert quid esse tribunatum putes... [I.23]
plurimum interest quid esse tribunatum putes... [I.23]
Accusative of Respect or Specification (Greek accusative or accusative of respect); accusative of the part affected.
Hoc tamen differunt... [I.4] "they differ in this respect"
Accusative of exclamation ["such expressions depend upon a long-forgotten verb" A&G 397d]
O rectam sinceramque vitam, o dulce otium honestumque ac paene omni negotio pulchrius.