Chasidut for Pirkei Avot 2:16
הוּא הָיָה אוֹמֵר, לֹא עָלֶיךָ הַמְּלָאכָה לִגְמֹר, וְלֹא אַתָּה בֶן חוֹרִין לִבָּטֵל מִמֶּנָּה. אִם לָמַדְתָּ תוֹרָה הַרְבֵּה, נוֹתְנִים לְךָ שָׂכָר הַרְבֵּה. וְנֶאֱמָן הוּא בַעַל מְלַאכְתְּךָ שֶׁיְּשַׁלֵּם לְךָ שְׂכַר פְּעֻלָּתֶךָ. וְדַע מַתַּן שְׂכָרָן שֶׁל צַדִּיקִים לֶעָתִיד לָבֹא:
He (R. Tarfon) was wont to say: The work is not yours to complete. [The Holy One Blessed be He did not hire you to complete all of it, in which instance you would lose your wage if you did not complete it.] And [lest you say: (In that case,) I will not learn and I will not take a wage] — you are not free to abstain from it. [Perforce the yoke is upon you to labor.] If you learn much Torah, you are given much reward, and Your Employer is trusted to pay you for your labor. And know that the reward for the righteous is in the world to come.
Mevo HaShearim
The term ‘hasid,’ by which the followers of the Besht are called, is not a new one. Already in the Prophets we find the term deployed to describe a person of a stature closest to holiness, such as “The hasid is lost” (Micah 7), “Guard my soul for I am a hasid” (Ps. 86), “His praise is amongst the congregation of hasidim” (ibid. 149), etc. Yet what remains unarticulated there is, which actions one might do in order to rise above the rest of Israel and be called a hasid? For every Israelite is commanded to fulfill the Torah and its commandments, ‘and you are not free to be exempted from it.’431Mishnah Avot 2:16. If so, the hasid must do more than fulfill the Torah and commandments—but how so? Merely by doing more of them, quantitatively and qualitatively?