If I understand the concept correctly (which is debatable), then it basically boils down to "what you believe and the kind of person you are determines what comes in to your life and you have control over that".
P
I don't think that's the proper understanding of the concept.
I think what we're talking about is literally "speaking things into existence" because your words have special magical power to create... like God.
That's not Biblical.
That's not rational.
The Good, the Bad, and the Nuance:
A.) Can having a positive outlook on things be helpful?
Sure.
Being positive and optimistic often helps us to merely "persevere", or "not give up"... and that's very tangible.
There's nothing wrong with being hopeful or optimistic... as long as we're not being irrational or unbiblical.
B.) Can God bless you for being a nice person, and doing good things?
Sure.
God will often bless our good behavior, in one way or another... but very often the blessing won't be anything visible or noticeable.
Biblically we "do good" to simply PLEASE GOD... not to GET STUFF FROM GOD.
Our good deeds and good works are to please God, not to manipulate God.
God is not going to bless our greed or selfishness... our motives matters.
C.) Can we demand God, or the universe, give us what we want?
No.
This is not rational or biblical.
We are created beings, we are fallen beings, we having nothing good in us except what God puts in us... we have no authority to MAKE DEMANDS of a holy God who created the universe out of nothing, and who had to save us from our own sin because we're so lowly and wicked we couldn't save ourselves.
To make demands is to invert our relationship with a holy God... he makes demands of us, not vice versa.
D.) Can we speak things into existence, like we're God?
No.
Again, this is not rational or biblical.
We don't have any creative power, and the holy spirit isn't a "force" that we bend to our will... we aren't Jedi Nights and Star Wars isn't real.
The holy spirit is a person, not a force that we use like some kind of tool to get what we want.
E.) There is a large group of people who DO proclaim both "C" and "D" are true.
Who is this group?
This group includes: witches, occultists, new age practitioners, mystics, and Christians who are false teachers.
This is not a group we should desire to join.
.