The whole concept of Bitul Torah [being idle from learning Torah] comes from a verse in Numbers 15 כי דבר השם בזה הכרת תכרת הנפש ההיא מעמיה. "For the word of God he despised". [That is the Torah is saying there to bring a sin offering for doing idolatry by accident, but not for doing idolatry on purpose. It might have stopped at that point. But then it continues to say this extra idea "for the word of God he despised." So you see this idea from the fact that the verse might have just stopped at saying one does not bring a sacrifice for a sin done on purpose.
This idea of ביטול תורה [being idle from learning Torah] is mostly ignored nowadays except in Litvak yeshivas where people are more aware of this issue.
That does not mean one can not learn a vocation. But it does mean that in the time one is not learning or being involved in his vocation he is required to be learning Torah.
However my feeling is it is best to learn Torah at home to avoid the confusing people that hang out around yeshivas trying to entice people into all kinds of insanity.
[This is the reason for the fact that Litvak yeshivas throw out people along with other reasons. I agree that the yeshivas are right about this general practice.]
The Rambam includes Physics and Metaphysics of the Ancient Greeks in the category of learning Torah. In any case, exactly what is called learning Torah in order to be safe from the sin of Bitul Torah tends to be unclear. The most strict definition would be only the exact text of the Old Testament and the two Talmuds. Then you would add the actual texts of Aristotle that the Rambam includes--the Metaphysics and Physics. I think however it is safe to enlarge the definition to learning Rashi, and Tosphot and the basic Rishonim, plus the Avi Ezri of Rav Shach along with Quantum Field Theory. But one has to evaluate very carefully what he wants to include in learning Torah.
[I should mention I found the Pnei Yehoshua very helpful. Also the books of the Gra I found very helpful. If all this seems too much the best thing is to simply learn the Mishna of R. Yehuda HaNasi along with the commentary of Rav Ovadiah from Bartenura
[If you are in the walking distance from the great Litvak NY yeshivas or Bnei Brak then by all means learn there. But if not, home is better than anything else. Also if you have the ability to start you own place along the lines of the straight Torah of the Litvaks that is of course the best thing.]
This idea of ביטול תורה [being idle from learning Torah] is mostly ignored nowadays except in Litvak yeshivas where people are more aware of this issue.
That does not mean one can not learn a vocation. But it does mean that in the time one is not learning or being involved in his vocation he is required to be learning Torah.
However my feeling is it is best to learn Torah at home to avoid the confusing people that hang out around yeshivas trying to entice people into all kinds of insanity.
[This is the reason for the fact that Litvak yeshivas throw out people along with other reasons. I agree that the yeshivas are right about this general practice.]
The Rambam includes Physics and Metaphysics of the Ancient Greeks in the category of learning Torah. In any case, exactly what is called learning Torah in order to be safe from the sin of Bitul Torah tends to be unclear. The most strict definition would be only the exact text of the Old Testament and the two Talmuds. Then you would add the actual texts of Aristotle that the Rambam includes--the Metaphysics and Physics. I think however it is safe to enlarge the definition to learning Rashi, and Tosphot and the basic Rishonim, plus the Avi Ezri of Rav Shach along with Quantum Field Theory. But one has to evaluate very carefully what he wants to include in learning Torah.
[I should mention I found the Pnei Yehoshua very helpful. Also the books of the Gra I found very helpful. If all this seems too much the best thing is to simply learn the Mishna of R. Yehuda HaNasi along with the commentary of Rav Ovadiah from Bartenura
[If you are in the walking distance from the great Litvak NY yeshivas or Bnei Brak then by all means learn there. But if not, home is better than anything else. Also if you have the ability to start you own place along the lines of the straight Torah of the Litvaks that is of course the best thing.]