What is the biblical basis for Christian Mysticism?

For a working definition of *Christian Mysticism* I'd like to quote the [top answer](https://christianity.stackexchange.com/a/2819/61679) to https://christianity.stackexchange.com/q/1942/61679 : > Christian Mysticism has a long and honourable tradition. You can read > the histories of many holy Christian mystics. [Wikipedia] will give > you a good starting point. Meditation is only one aspect. For a > working definition, try: ""that part, or element, or Christian belief > and practice that concerns the preparation for, the consciousness of, > and the effect of [...] a direct and transformative presence of [the > Christian] God" (Bernard McGinn). In effect mystics are those who make > real and experience for themselves things that many Christians take as > theoretical or abstract - e.g. the presence of God, union with God, > the indwelling of the Holy Spirit. > > Here are some well-known people and practices that form part of the > Christian Mystic tradition: > > - Spiritual Exercises of St. Ignatius Loyola > - Meister Eckhart > - Brother Lawrence > - Julian of Norwich > - Teresa of Avila > - St John of the Cross > - Thomas Merton > > : http://en.wikipedia.org/wiki/Christian_mysticism I also recently asked another question, https://christianity.stackexchange.com/q/98040/61679 , and according to the answers posted so far I've been pleasantly surprised by the fact that the pursuit of a profoundly mystical union with God is highly regarded in Catholicism, Eastern Orthodoxy, Oriental Orthodoxy, and arguably even in some branches of Protestantism ([this answer](https://christianity.stackexchange.com/a/98044/61679) makes a case for mysticism in Protestantism specifically). What is the biblical basis for Christian Mysticism?