This opinion, in fact, extends to codification in Jewish Law: "[One] should work every day, sufficient for his living.. and should busy himself with Torah the rest of the day and night; one who supports himself with his own hands is on a great level" [REF].
Rabbinic Tradition recognizes that achieving an appropriate balance could pose both practical and philosophic challenges (e.g. the requirement for secular education as opposed to limited vocational training), and the various issues are therefore widely discussed - in various tractates in the Talmud (see Berachot 35b), in the halakhic literature (e.g.