Mishnah for Sukkah 52:5
ת"ר הנכנס לישן ביום רצה חולץ רצה מניח בלילה חולץ ואינו מניח דברי רבי נתן רבי יוסי אומר הילדים לעולם חולצין ואינן מניחין מפני שרגילין בטומאה
Our Rabbis taught: One who wishes to go to sleep by day, if he wants he may remove [his tefillin] and if he wants he may leave them on. At night, he must remove them and he may not leave them on, the words of R. Natan. R. Yose said Youth must always remove them and never leave them on, for they are regular in uncleanness.
Pirkei Avot
He [Rabbi Tarfon] used to say: It is not your duty to finish the work, but neither are you at liberty to neglect it; If you have studied much Torah, you shall be given much reward. Faithful is your employer to pay you the reward of your labor; And know that the grant of reward unto the righteous is in the age to come.
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