Pirke Avot [without footnotes]

5. R. Chanina, the son of Hakinai, said, "He who keeps awake at night, and goes on his way alone, while turning his heart to vanity, such a one forfeits his own life."

6. R. Nechunya, son of ha-Kanah, said, "Whoso receives upon himself the yoke of the Torah, from the yoke of the kingdom and the yoke of worldly care will be removed, but whoso breaks off from him the yoke of the Torah, upon him will be laid the yoke of the kingdom and the yoke of worldly care."

7. R. Chalafta, the son of Dosa, of the village of Chanania said, "When ten people sit together and occupy themselves with the Torah, the Shechinah abides among them, as it is said, 'God standeth in the congregation of the godly.' And whence can it be shown that the same applies to five? Because it is said, 'He hath found