Caesar dum magnus ad altum Fulminat Euphraten bello, victorque volentis Per populos dat iura, viamque adfectat Olympo(331),
seem intended to leave the thought of his actual greatness as the abiding impression on the mind of the reader; as the concluding lines of the Invocation seem intended to make his presence felt as that of its inspiring deity. While we cannot doubt that the admiration expressed by Lucretius is the sincere and generous tribute of genius acknowledging a great debt and unconsciously exaggerating the nobleness of its benefactor, it is impossible to determine how far Virgil's language is the expression of sincere conviction, and how far it is dictated by the necessities of his position.
But it is in their invocations of a Superior Power to aid them in their task that we recognise the strongest contrast between the philosophic poet, who, while denying all supernatural agency, is yet carried away by his imagination to attribute consciousness, will, and passion to the great creative Power of Nature,--the source of all life, joy, beauty, and art,--and the 'pius vates,' influenced by the religious sense of man's dependence on a Spiritual Power, deeply feeling the poetical charm of the old mythology, and striving to effect some reconcilement between the fading traditions of Polytheism and the more philosophical conceptions prevalent in his time. Lucretius for the moment adopts the symbolism of ancient mythology, and probably the actual figures of pictorial art (which elsewhere he speaks of as a great source of human delusion), to impart visible presence, colour, and passion to his thought; but he leaves no doubt on the reader's mind that his representation is merely symbolical. Virgil, on the other hand, appears in the opening lines of the Georgics to attribute a distinct personality to the beings of that composite Polytheism which had gradually grown up out of the union of Greek art and Roman religion, but which it is difficult to comprehend as having any real hold over the minds of men who had received any tincture of Greek philosophy. In the divine office which he assigns to Caesar he adopts the latest addition to this eclectic Pantheon; and this new divinity he introduces in the midst of the old gods, just as he fancifully introduces Gallus in the Eclogues amid the choir of Apollo and the Muses.