The phrase alludes to a small, often ornate, container crafted from a fine-grained, translucent form of gypsum. These vessels were historically used to hold precious oils, perfumes, or ointments. The material’s delicate nature signified the value of its contents, and breaking the box was sometimes required to fully access the substances within. This action symbolized a complete offering or act of sacrifice.
Its significance stems from its association with acts of devotion, extravagance, and profound humility. The act of anointing with the oil held within was considered a sign of honor, reverence, and purification. Historically, breaking open such a container represented an unrestrained expression of emotion, often connected to spiritual awakening or a moment of impactful generosity. The costliness of both the container and its contents underscores the magnitude of the offering.