Another motive for fidelity is added, namely, the entire dependence of the promised land upon God for its fertility. It was “a land flowing with milk and honey;” yet this its richness was not, as was that of Egypt, the reward of truman skill and labor, but was, on the contrary, the gift of God simply and entirely; the effect of “the former and the latter rains” sent by Him. The spiritual significance of these and many other such peculiarities of the promised land must not be overlooked.
Egypt and Canaan are distinguished in this and the following verses, by certain of their most remarkable physical traits. Canaan as a mountainous country (compare Deuteronomy 3:25 note) was well watered, but by the rains of heaven, on which it absolutely depended for its crops. Artificial irrigation could do nothing to remedy this dependence. Hence, it was a land on which, so long as God’s people were faithful and consequently prosperous, “the eyes of God” would always be: i. e., He would supply at each successive season (compare Deuteronomy 11:14-15) the useful conditions of productiveness. But Egypt, fit emblem here as elsewhere of the world of nature in distinction from the world of grace, though of course deriving its all ultimately from the Giver of all good things, yet directly and immediately owed its riches and plenty to human ingenuity and capital. It enjoyed no rain worth speaking of, but drew its water supply from the annum overflowing of the Nile. This only lasts about a hundred days; but is rendered available for agricultural purposes throughout the year by an elaborate and costly system of tanks, canals, forcing machines, etc. To these mechanical appliances allusion is made in Deuteronomy 11:10. The inhabitants of Egypt probably watered “with the foot” in two ways, namely, by means of tread-wheels working sets of pumps, and by means of artificial channels connected with reservoirs, and opened, turned, or closed by the feet. Both methods are still in use in Egypt.