Genuflection is a sign of reverence to the Blessed Sacrament. Its purpose is to allow the worshipper to engage his whole person in acknowledging the presence of and to honor Jesus Christ in the Holy Eucharist. It is customary to genuflect whenever one comes into or leaves the presence of the Blessed Sacrament reserved in the Tabernacle. "This venerable practice of genuflecting before the Blessed Sacrament, whether enclosed in the tabernacle or publicly exposed, as a sign of adoration, ...requires that it be performed in a recollected way. In order that the heart may bow before God in profound reverence, the genuflection must be neither hurried nor careless." A common-sense exception applies to a sacristan or custodian for whom it would be impractical to constantly be genuflecting in the course of their duties.