Catholic spirituality must be based in the sacraments

I cannot stress this enough. Any other form of mysticism that teaches “union with the divine” or your “divine inner self” is not Catholic. As Catholics our union with God must always flow from prayer and the sacraments, this is authentic catholic spirituality and mysticism. Anything else is counterfeit. 

We have been blessed with the Catechism, writings of the saints and more specifically approved Doctors (teachers) of the Church, and of course the Bible itself. Stick with the basics.