With respect to all whose views are many:
The problem that arises, concerning mysticism, can be seen in the second definition that DM provided for us.
Religious matters are serious, because they go beyond selfish human fancy and whim. And they deal with the extreme problems that humanity faces- at least they are supposed to- not merely the personal human individualisms that often dominate selfish human thought.
At Genesis 1:28, when God is recorded to have said: "Be fruitful and become many", it was a 'human family' that was to accomplish this. And the man, Adam, was to live to see it.
The downward spiral into weakening human health, loss of loved ones and family, extreme violence and suffering, the inevitable destruction of planetary environment- even the selfish overpopulation of confined areas, rather than a sustainable, pleasant, orderly advancement across the globe (and possibly beyond), would continue, unless human actions were restricted by serious intervention, at some point.
With this critical need approaching its manifestation, is their room for self-oriented concepts to take precedence over the serious nature of what is to happen?
Since this a religious chamber of discussion, one is free to note that the human family, its unity and deliverance from what really hinders it, and its reconciliation with the Power able to rescue it, both becomes and remains, the orientation of the day; until such time as man can devote himself to areas of life that he may then elaborate on, within a framework is accurate, beneficial and inarguable.
Not to suggest that life in the 'here and now' should be without joy, light-heartedness or even appropriate humor, of course.
Mysticism is beyond my field of deeper knowledge, but- apart from some pleasant historical investigation- I would promote, not what is necessarily popular, but what is beneficial for the human family, and its long-term needs.
Many levels of sacrifice were suffered, to bring about what is promised, at Revelation 22:1-2:
"And he showed me a river of water of life, clear as crystal, flowing out from the throne of God and of the Lamb,
down the middle of its main street. On both sides of the river were trees of life producing crops of fruit, yielding their fruit each month. And the leaves of the trees were for the healing of the nations."