A few words on Avot 3:12
A few words of kabbalistic midrash on Pirkei Avot 3:12

(יב) רַבִּי יִשְׁמָעֵאל אוֹמֵר, הֱוֵי קַל לְרֹאשׁ, וְנוֹחַ לְתִשְׁחֹרֶת, וֶהֱוֵי מְקַבֵּל אֶת כָּל הָאָדָם בְּשִׂמְחָה:

(12) Rabbi Ishmael said: be suppliant to a superior, submissive under compulsory service, and receive every man happily.

Become light for the Head (הֱוֵי קַל לְרֹאשׁ) – this is Arikh Anpin, before whom we must be insignificant as nothing.
And be Noach for the Black-Haired (וְנוֹחַ לְתִשְׁחֹרֶת) – this is Ze’eir Anpin, before whom we must be as Noach who comforts and gives rest from the toils of our hands.
And become a welcomer of every human in happiness (וֶהֱוֵי מְקַבֵּל אֶת כָּל הָאָדָם בְּשִׂמְחָה) – this is the Shekhinah, who only dwells within humanity in joy.