M. Tullius Cicero Pro Archia Poeta 20

[20] For there was no one so disinclined to the Muses as not willingly to endure that the praise of his labours should be made immortal by means of verse. They say that the great Themistocles, the greatest man that Athens produced, said, when some one asked him what sound or whose voice he took the greatest delight in hearing, “The voice of that by whom his own exploits were best celebrated.” Therefore, the great Marius was also exceedingly attached to Lucius Plotius, because he thought that the achievement which he had performed could be celebrated by his genius.