in which he teaches that working in the fields is as fundamental to Torah as study
The Sages of Yavneh would often say, "I am a creature and my comrade is a creature. My craft is in the city and his in the fields. I rise early to work and he rises early to work. Just as he does not dwell on my work so do I not dwell on his." It is common knowledge that there was a great yeshiva of sages and authors in Yavneh. They nevertheless did not hold themselves in high esteem with prideful or coarse attitudes for having chosen Torah as their craft. They did not scorn simpler folk, as we unfortunately may see in our day, when children's teachers act as though they are above others, and as though they were halakhic adjudicators or presided over the rabbinic courts of our predecessors. On this matter, they said: We consider that our craft of Torah is more important than that of those who work the land in the fields and vineyards; nevertheless, we praise their work and toil as we do our own, for they rise early to their task, as we do. We are not to dwell upon their craft as sages, just as they cannot dwell upon ours. Should you say that they are at a disadvantage for not having time to study Torah, this is not to their detriment, for if they study only a little Torah because they do not known how to study or have little time, they are useful to others through the fruit of their labor. If no seeds are sown and there is no bread for food, the sages among us will die of hunger; those who toil in the fields, therefore, is fundamental to Torah and to those who study it.
Petackh Eina'im, p. 21b, Livorno, 1878