Mishnah 4 - Chapter 6 - Pirkei Avot

Kach hi darkah shel torah, pat bammelach tochel, umayim bammesurah tishteh, ve'al ha'aretz tishan, vechayei tza'ar tichyeh, uvattorah attah amel, im attah oseh ken ashreicha vetov lach, ashreicha ba'olam hazzeh vetov lach la'olam habba.

Such is the way [of a life] of Torah: you shall eat bread with salt, and rationed water shall you drink; you shall sleep on the ground, your life will be one of privation, and in Torah shall you labor. If you do this, “Happy shall you be and it shall be good for you” (Psalms 128:2): “Happy shall you be” in this world, “and it shall be good for you” in the world to come.

This is the way of Torah: A loaf with salt shall you eat, and water by measure shall you drink, and on the ground shall you sleep, and a life of travail shall you live, and in Torah shall you toil. And if you do so — you are fortunate and it is good for you. You are fortunate in this world and it is good for you in the world to come. Do not seek greatness for yourself, and do not lust for honor. More than your learning, do! And do not lust for the table of princes. For your table is greater than theirs, and your crown is greater than theirs, and your Master is trusted to pay you the wage of your work.