But a person must do everything possible to reach “for its own sake.” If he does not make the effort, if he does not reach the level of “for its own sake,” he can fall into the trap of the “impure maidservant,” who stands in opposition to the holy maidservant. The task of the [impure maidservant] is to confuse a person, such that the “not for its own sake” does not become “for its own sake.” That is what the verse in Proverbs means when it states, “The maidservant who displaces her mistress” (Prov. 30:23). For the [impure maidservant] will not allow the person to come close to the mistress, the holy Shekhina.
Acting Lishmah and the Battle of Pure Intention
Baal HaSulam's Introduction to Zohar 31:3