Suetonius,
The Lives of the Twelve Caesars…
“ While I stood covered with awe, and filled with a religious dread, beseeching him to allow me to see him face to face, he said; 'Go tell the Romans, that the gods do will, that my Rome should become the capital of the world. Therefore let them cultivate the art of war, and let them know and hand down to posterity, that no human power shall be able to withstand the Roman arms.' Having said this, he ascended up to heaven. ”
