Spiritual writers speak of different kinds of private prayer: vocal and mental prayer, affective and discursive prayer, formal and spontaneous prayer, meditation, contemplation, and mystical prayer. But distinctions often break down as one type of prayer shades over into another. The vocal praying of the Rosary can easily lead to a contemplative centering of the person or to an imaginative meditation on the mysteries of the life of Jesus. A discursive meditation can simplify into contemplation, including the deep contemplation verging on what the tradition has called "infused" or "mystical" prayer. For the sake of clarity we will follow the traditional distinctions of vocal (oratio), mental (meditatio), and contemplative prayer (contemplatio), recognizing the limitations of the categories themselves.
Vocal Prayer
Vocal prayer is a way of addressing God using either formal as the Our Father, the Hail Mary, the Glory to the Father, or simply sharing prayers with God the thoughts and concerns of our hearts in our own words. We should never think of such formal or conversational prayer as a kind of second-class prayer. Formal people want to pray but find themselves without the words to express their feelings, prayers can be a great help in those times when we particularly experience the emptiness we sometimes experience.
Praying to God conversationally can be a profound experience when we feel great interior joy or sorrow or struggle. We should be able to express ourselves freely to God when we are so moved. Both kinds of vocal prayer should be a part of our daily lives, just as sometimes we need to wait for the Lord in silence and expectation. What is important is that we pray honestly from the heart rather than trying to force something that doesn't truly express our inner feelings.
Some kinds of vocal prayer call not just on our minds and feelings but on our bodies and imaginations. The Rosary is an ancient method of prayer that combines simple prayers hallowed by the tradition with brief meditations on events in the life of Jesus and Our Lady. It is a kind of mantra prayer, quieting the mind and the imagination by fingering the beads and repeating over and over the simple words of the Hail Mary while focusing on the mystery the annunciation, the birth of Jesus, his crucifixion, the descent of the Holy Spirit, and so forth. The Stations of the Cross is another prayer that combines vocal prayer and meditation on the mysteries of Christ's passion with bodily movement, sometimes standing, sometimes kneeling, walking with Jesus from one scene to the next.