by benissimus » Tue Jan 11, 2005 3:22 pm
The dative is always used for indirect objects, the only time you would use ad is if you were considering the English "to" to be expressing motion. The line between these two uses is often mottled, but I believe the dative would certainly be more correct in the sentence you gave.
flebile nescio quid queritur lyra, flebile lingua murmurat exanimis, respondent flebile ripae