Les Psaumes 128:2 Cabale : Zohar & Sha'arei Kedusha

Then he would enter into that place until he reached those who abode there, and he would show them his ring, and there he gained all his knowledge of strange sciences (i.e. witchcraft). When they had told him all that he required he would fly back to his palace in the same way that he came. Then, as he sat once more on his throne, he would reflect upon all that he had gone through, and would conceive ideas of profound wisdom; and it is in reference to such an occasion that he says: “So I returned and considered all the oppressions that are done under the sun….”

Our sages, of blessed memory, stated,⁴⁸³Mishnah Avot 6:4 “Such is the way of [the life] of Torah: You shall eat bread with salt and drink rationed water; you shall sleep on the ground and your life will be one of privation, and you shall labor in Torah. If you do this,⁴⁸⁴Psalms 128:2 ‘You shall be happy and it shall be good for you.’ That is, ‘You shall be happy’ in this world, ‘and it shall be good for you’ in the coming world.” Similarly, our sages, of blessed memory, stated,⁴⁸⁵Talmud Bavli, Brachot 63a “The words of Torah are only sustained in one who kills himself over them.” They also said,⁴⁸⁶Mishnah Avot 2: “Whoever increases his flesh, increases his maggots.”