Mystics are people who are putting themselves into direct relation with God. The students of mysticism must confine themselves to the experiences of mystics, the God or any absolute truth that they ar trying to reach or understand.
Some samples for Christian mystics are
Clement of Alexandria
St. Augustine
St. Gregory I
St. Anselm
Hugh of Saint Victor
St. Thomas Aquinas
St. Bridget of Sweden and
St. Joan of Arc.
Some samples for Muslim mystics (also called sufi) are
al-Ghazali
Jalal ad-Din Rumi
Hafiz
Sadi and
Yunus Emre