If seven is the symbol of perfection, why do we not receive all seven sacraments?
Seven is a symbol of perfection in biblical numerology, and the fact that there are seven sacraments may symbolize the perfection of God’s grace offered to mankind collectively through the work of Christ on the cross. Nonetheless, it is not necessary for individuals to receive all seven sacraments. Some of the sacraments, particularly the vocational sacraments of holy orders and matrimony, are meant to empower or strengthen the individual in his state of life. He does not need sacraments that do not pertain to his individual vocation.