A Prayer of Many
It is as our sages [a sage is the one who has attained the Creator] said: “Anyone who is saddened for the public [as for himself and before himself, exactly for this reason] is rewarded and sees the comfort of the public.” The public is called “The Holy Shechina (Divinity)” since public means a collective, meaning the assembly of Israel, since Malchut is the collection of all the souls. [That is, the one who exerts himself for the correction of the collective soul merits the comfort of seeing it].
– Baal HaSulam. Shamati (I Heard), Article No. 35, “Concerning the Vitality of Kedusha”