“The celebration of the Eucharist is the greatest and most exalted form of prayer and is the centre and source from which the other forms receive their ‘lifeblood’: the Liturgy of the Hours, Eucharistic adoration, ‘lectio divina’, the Holy Rosary and meditation…” Pope Benedict XVI Homily Sunday, May 3, 2009

The mass as Prayer is not discussed in the Stages of Prayer document, but all the other forms he mentioned are explained.