@PeanutGallery has every right to reject all forms of mysticism. As balshan has often noted, that the rcc opts for an experience of God that goes beyond the restraints of Scripture. There is a danger in emphasising experience over Scripture. I don't doubt there are other religious groups that practice a form of so called "christian mysticism". Even so, that does not make the practice safe or even acceptable.
The so called "christian mysticism" promotes rituals and routines, which are designed to create within a person a emotional state, that is followed by mystical practices of prayer and worship. There is pomp, ceremony, candles, recited prayers, use of the rosary, prayer ropes, Stations of the Cross, icons, crucifixes, incense, chants, etc....
All of these things prey upon human emotions to give a mystical feeling of closeness to God.
But in reality, they usurp God's written word as the means of knowing God. We stand on Scripture alone, as the revelation of God, and His will for our lives. The revelation of Him and His will is all laid out in Scripture.
Only God decides what is and is not righteous and He reveals this through Scripture, not the experience of those who have a false humility in worshiping something other than God Himself, nor in those who claim new revelation from God. Jesus Christ is sufficient, so do not allow anyone to intimidate you by their claims of spirituality
based in anything other than in knowing God through Scripture.