I read the entire Aeneid twice, once in each language, once upon a time. Needless to say, I did not remember this line, although it aptly describes so much of human history: "easy is the descent to Hell"
Although, I question whether the line has been reproduced faithfully; "facilis descensus Averno est" seems the more likely arrangement in the original. Of course, that would be a prose trope, putting the verb last: one imagines that was a good reason to write it this way in verse.
For more Virgil references, see here.