Does anyone know of any specific sources in Chazal or Rishonim (or even earlier achronim) that indicate that l'chatchila all Jewish males should learn full time forever? I know that this is the opinion of R' Shiman Bar Yochai in Berachos 35b, but the conclusion of that gemara seems to be that most people should not go in this direction. There is also the opinion of R' Nehorai at the end of Kidushin, but I don't know if there is any indication that this is how we poskin. Also, I'm not sure that his opinion is necessarily the same idea.
Someone told me that the Nefesh HaChaim says this, but I couldn't find it.
This is a very prevalent strain of thought in the charedi world, especially in Israel. I was just wondering if anyone knows any sources that back this up, especially since there are many sources that seem to go against this, like the aforementioned gemara in berachos, the mishna in Avos - "yafe Torah im derech eretz" - which all the rishonim I've seen on it (Rashi, the Rambam, Rabbeinu Yonah, Rav Ovadiah m'Bartenura) say that it means that it is good to work for a living.