Suetonius,
The Lives of the Twelve Caesars…
“ It is not surprising, that the progress of the human mind, which, in moral science, after the first dawn of enquiry, was rapid both amongst the Greeks and Romans, should be slow in the improvement of such branches of knowledge as depended entirely on observation and facts, which were peculiarly difficult of attainment. Natural knowledge can only be brought to perfection by the prosecution of enquiries in different climates, and by a communication of discoveries amongst those by whom it is cultivated. ”
