De Agricultura
Philo Judaeus
The works of Philo Judaeus, the contemporary of Josephus, volume 1. Yonge, C. D., translator. London: Henry G. Bohn, 1854.
For Moses says, "Every tree which bringeth not forth fruit good to eat thou shalt cut down; and thou shalt make it into stakes against the city which shall make war upon them." [*](Deuteronomy xx. 20. ) And these trees are likened to those powers developed in words alone, which have nothing in them but mere speculation,