Judaism has an interesting concept called a minyan, a prayer quorum. Special prayers sanctifying God’s name (such as the kedushah and kaddish prayers) may only be said when ten men are present. An individual may pray in solitude, but without a minyan, certain parts of the liturgy must be omitted.
The Talmud derives the requirement for a prayer quorum from God’s declaration, “I will be sanctified in the midst of the Israelites” (Lev. 22:32). What exactly does the word ‘midst’ mean?
We find the word ‘midst’ used again when God warned the people living nearby the dissenters in Korach’s rebellion: “Separate yourselves from the midst of this ‘eidah’ (community)” (Num. 16:20). From here, the Sages learned that God is sanctified within an eidah.
And what is the definition of eidah? The Torah refers to the ten spies who brought a negative report of the Land of Israel as an eidah ra’ah, an evil community (Num. 14:26). So we see that God is sanctified in a community of at least ten members.
The requirement for a prayer quorum, and the way it is derived, raises two issues that need to be addressed:
Holiness is based on our natural aspirations for spiritual growth and perfection. However, the desire to perfect ourselves — even spiritually — is not true holiness. Our goal should not be the fulfillment of our own personal needs, but rather to honor and sanctify our Maker. Genuine holiness is an altruistic striving for good for its own sake, not out of self-interest.
The core of an elevated service of God is when we fulfill His will by helping and uplifting society. Therefore, the kedushah (sanctification) prayer may not be said in private. Without a community to benefit and elevate, the individual cannot truly attain higher levels of holiness.
This special connection between the individual and society is signified by the number ten. Ten is the first number that is also a group, a collection of units forming a new unit. Therefore, the minimum number of members for a quorum is ten.
Why do we learn this lesson from the wicked? It is precisely the punishment of the wicked that sheds light on the reward of the righteous. If the only result of evil was that the wicked corrupt themselves, it would be unnecessary for the law to be so severe with one who is only hurting himself. However, it is part of human nature that we influence others and are influenced by our surroundings. Unfortunately, evil people have a negative influence on the entire community, and it is for this reason that they are punished so severely.
Understanding why the wicked are punished clarifies why the righteous are rewarded. Just as the former are punished principally due to their negative influence on the community, so too, the reward of the righteous is due primarily to their positive influence. Now it becomes clear that true holiness is in the context of the organic whole. And the kedushah prayer sanctifying God’s Name may only be recited in a minyan, with a representative community of ten members.
(Gold from the Land of Israel pp. 258-260. Adapted from Ein Eyah vol. I, p. 104.)