1:6א׳:ו׳
1 א

עֲשֵׂה לְךָ רַב. רַמְבַּ"ם פֵּרֵשׁ, אַף עַל פִּי שֶׁאֵינוֹ רָאוּי לִהְיוֹת לְךָ רַב, עֲשֵׂה אוֹתוֹ רַב עָלֶיךָ וְלֹא תִּלְמֹד בֵּינְךָ לְבֵין עַצְמְךָ. וַאֲנִי שָׁמַעְתִּי, עֲשֵׂה לְךָ רַב, שֶׁיְּקַבֵּל לוֹ רַב אֶחָד שֶׁיִּלְמֹד מִמֶּנּוּ תָּמִיד, וְלֹא יִלְמֹד הַיּוֹם מֵאֶחָד וּלְמָחָר מִן הָאַחֵר. וְאַף עַל גַּב דִּבְמַסֶּכֶת עֲבוֹדָה זָרָה (דף י"ט) אָמְרוּ הַלּוֹמֵד תּוֹרָה מֵרַב אֶחָד אֵינוֹ רוֹאֶה סִימַן בְּרָכָה, כְּבָר פֵּרְשׁוּ וְאָמְרוּ הָנֵי מִלֵּי בִּסְבָרָא, שֶׁטּוֹב לוֹ לִשְׁמֹעַ סְבָרַת הָרַבִּים, אֲבָל לְעִנְיַן גְּמָרָא, מֵחַד רַב מְעַלֵּי, כִּי הֵיכִי דְּלֹא לִפְגֹּם לִשָׁנֵיהּ:

"Make for yourself a (Torah) mentor": Rambam explained, “Even though he is not fit to be your teacher, make him into your teacher and do not learn on your own.” And I heard, “'Make for yourself a teacher,' [meaning] that he should take on one teacher from which always to learn – and not learn from one today and from another one tomorrow." And even though they stated in tractate Avodah Zara 19, “One who learns from [only] one teacher will not see a sign of blessing;” they have already explained and said, “this applies to reasoning” - as it is good for him to hear the reasoning of the many - “but with concern to [memorization of traditional teachings], it is better from one teacher, so that [the student's] elocution not be damaged."

2 ב

וּקְנֵה לְךָ חָבֵר. וַאֲפִלּוּ אַתָּה צָרִיךְ לִקְנוֹתוֹ בְּדָמִים יְקָרִים וּלְפַזֵּר עָלָיו מָמוֹן כְּדֵי שֶׁתִּקְנֶה אַהֲבָתוֹ. אֲבָל בְּרַב לֹא שַׁיָּךְ לוֹמַר קְנֵה לְךָ רַב, שֶׁהָרַב צָרִיךְ לְלַמֵּד בְּחִנָּם:

"acquire for yourself a friend": And even if you need to acquire him for a large sum and to spend money upon him in order to acquire his love. But with a mentor, it is not applicable to say, "Acquire for yourself a mentor," as a [teacher of Torah] must teach for free.

3 ג

וֶהֱוֵי דָן אֶת כָּל הָאָדָם לְכַף זְכוּת. כְּשֶׁהַדָּבָר בְּכַף מֹאזְנַיִם וְאֵין לוֹ הֶכְרֵעַ לְכָאן וּלְכָאן, כְּגוֹן אָדָם שֶׁאֵין אָנוּ יוֹדְעִים מִמַּעֲשָׂיו אִם צַדִּיק אִם רָשָׁע וְעָשָׂה מַעֲשֶׂה שֶׁאֶפְשָׁר לְדוּנוֹ לִזְכוּת וְאֶפְשָׁר לְדוּנוֹ לְחוֹבָה, מִדַּת חֲסִידוּת הִיא לְדוּנוֹ לְכַף זְכוּת. אֲבָל אָדָם שֶׁהֻחְזַק בְּרָשָׁע, מֻתָּר לְדוּנוֹ לְחוֹבָה, שֶׁלֹּא אָמְרוּ אֶלָּא הַחוֹשֵׁד בִּכְשֵׁרִים לוֹקֶה בְּגוּפוֹ (שבת צז.), מִכְּלָל שֶׁהַחוֹשֵׁד בִּרְשָׁעִים אֵינוֹ לוֹקֶה:

"and judge every person as meritorious": when the matter is hanging in the balance and there is no way to decide it in this way or that way. For example, a man from whose actions we do not know if he is righteous or wicked, who preforms an act that is possible to judge favorably and possible to judge unfavorably, it is pious to judge him favorably. But it is permissible to judge a man who is established to be evil unfavorably. As they only stated (Shabbat 97), “one who suspects righteous people is afflicted on his body” - [and so] it is implied [from this] that one who suspects evildoers is not afflicted.