Reference for Pirkei Avot 2:15

רַבִּי טַרְפוֹן אוֹמֵר, הַיּוֹם קָצָר וְהַמְּלָאכָה מְרֻבָּה, וְהַפּוֹעֲלִים עֲצֵלִים, וְהַשָּׂכָר הַרְבֵּה, וּבַעַל הַבַּיִת דּוֹחֵק:

R. Tarfon says: The day [i.e., life in this world] is short, and the labor is great [i.e., Torah study is endless], and the workers are indolent, and the wage is much, and the Employer presses [viz. (Joshua 1:8): "And you shall meditate in it (Torah) day and night."]

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