De Agricultura
Philo Judaeus
The works of Philo Judaeus, the contemporary of Josephus, volume 1. Yonge, C. D., translator. London: Henry G. Bohn, 1854.
We must therefore advise those who are beginning to learn not to go forth into such contests, for they have not sufficient knowledge; and we must counsel those who are making some progress to abstain from them, because they are not perfect; and those who have now for the first time just attained to perfection, we must urge to forbear, because in some degree their perfection has escaped their own notice.