If we cannot receive Holy Communion physically, either because we cannot make it to Mass or because we need to go to Confession first, we can pray an Act of Spiritual Communion, in which we express our desire to be united with Christ and ask Him to come into our soul. A spiritual communion is not sacramental, but prayed devoutly, it can be a source of grace that can strengthen us until we can receive the Sacrament of Holy Communion once again.