There was also time for extensive reading. That Vergil ranged widely and
deeply in philosophy and history, antiquities and all the world's best
prose and poetry, the vast learning of the _Georgics_ and the _Aeneid_
abundantly proves. The epic story which he had early plotted out must
have lain very near the threshold of his consciousness through this
period, for his mind kept seizing upon and storing up apposite incidents
and germs of fruitful lore. References to Aeneas crop out here and there
in the _Georgics_, and the mysterious address to Mantua in the third book
promises, under allusive metaphors, an epic of Trojan heroes. Nor could
the poet forget the philosophic work he had so long pondered over. Doubts
increased, however, of his capacity to justify himself after the sure
success of Lucretius. A remarkable confession in the second book of the
_Georgics_ reveals his conviction that in this poem he had, through
lack of confidence, chosen the inferior theme of nature's physical
and sensuous appeal when he would far rather have experienced the
intellectual joy of penetrating into nature's inner mysteries.[5]

[Footnote 5:
Me vero primum dulces ante omnia Musae,
Quarum sacra fero ingenti percussus-amore,
Accipiant, caelique vias et sidera monstrent--
Sin, has ne possim naturae accedere partes,
Frigidus obstiterit circum praecordia sanguis,
Rura mihi et rigui placeant in vallibus amnes.
_Georgics_, II. 475. ff.

Was this striking _apologia of the Georgics_ forced upon Vergil by
the fact that in the _Aetna_, 264-74, he had pronounced peasant-lore
trivial in comparison with science?]