Which denominations consider it commendable to pursue a profound mystical union with God?

If an individual earnestly hungers for deep spirituality, including a desire for attaining a profound degree of sanctification and consecration, but also for a profound, mystical, supernatural relationship with God, which denominations would find this attitude commendable? My educated guess is that at least Eastern Orthodoxy would. I say this having in mind saints such as [Porphyrios of Kafsokalyvia](https://en.wikipedia.org/wiki/Porphyrios_of_Kafsokalyvia) , of whom books have been written, including [*Elder Porphyrios Testimonies and Experiences*](https://www.amazon.com/dp/9606890236) : > *"Elder, where can we find the solution to our problems?"* > > *"Only holiness will solve your problems."* > > The realm of the sacred and the transcendent, as expressed by that > child of God and true man, Elder Porphyrios, belongs to the category > of the unbelievable. It can however become believable because, «sin > does not prevail where grace abounds”. Elder Porphyrios was a person > filled with grace, a bearer of the power of the Holy Spirit, a child > of the Kingdom, a genuine and true tree of paradise. > > Whoever wishes to speak about the inner spiritual life of a saint, > must be a saint himself. We, the writers of this book, are not saints. > We are confined to what we saw and what we heard. We are amongst those > many others, who, as St. Luke the Evangelist says, have “taken in hand > to set in order a narrative.” We are not trying, with our poor and > futile speech, to describe the life of a contemporary saint, but > rather we are falteringly trying to express our joy in having met a > saint; our joy that Christ lives yesterday, today and forever; our joy > that holiness is not a thing of the past, that grace can be felt next > to us, that our hands touched a “little father” who really lived the > expression “I no longer live, for Christ lives in me.” > > Until the Lord reveals the servant who was Elder Porphyrios’ > eye-witness, who observed him throughout his life and in all his works > and will write about his life accurately and fully, we are forgiven. > For we have only seen “in part.” We describe, write about and speak of > the miraculous things that God did for us through His servant, > Porphyrios. Is my educated guess correct? Which other denominations share the same sentiment? --- For a discussion of the meaning of *Christian mysticism* and its biblical basis, see https://christianity.stackexchange.com/q/98050/61679 . A closely related concept is *Theosis*: https://christianity.stackexchange.com/q/98106/61679 , https://christianity.stackexchange.com/q/98092/61679