There is nothing more important than our thinking - so long as that thinking is of the most important kind...
The obvious difficulties are first that almost-everything in our culture and habits tells us that thinking is trivial, is merely an epiphenomenon to the 'real' stuff which is all about action, material things - the perceived and measured world.
And yet... Why is it that 'thought crime' became a phenomenon in the evil totalitarian dictatorships? And why is it that this crime has returned to dominate 21st century life. After all, what is a 'hate crime' (which can get you sacked, mobbed and imprisoned) except a crime of thinking.
Even if you don't believe that your thinking matters in the modern world, even if you believe that thinking is just something that goes on inside your head - the Establishment, the Authorities disagree. They believe that thinking what they regard as the 'wrong' thing is a serious crime, and the legal system (and employment law) has been reshaped to accommodate this.
So - officially - thinking affects reality; and it is assumed that specific kinds of thinking can be inferred or imputed.
But a Christian will recognize that the Establishment/ Authorities/ Officialdom/ Media are evil; and are imposing a system of increasingly inverted values - where lies are truth and truth is 'fake news', where vile ugliness and mutilation is beauty and beauty is oppressive, where purposive evil rewrites morality so that marriage, family and Christianity are presented as breeding grounds for racism and terrorism.
What They say is good is always evil (in implemented practice, if not theoretically), and what they excoriate most systematically and over the long-term is the genuine good.
So, when They create (or reintroduce) the concept of thought crime; they are acknowledging the primacy of spiritual warfare; but taking the side of evil.
Christians, on the other hand, all-too-often ignore or deny that we live in a state of spiritual war - and especially that the side of evil in this war rules the world, including all the major social institutions, including the major Christian churches.
Such are the End Times, and Christians cannot claim we were not warned. Although the prophecies turned-out very differently than expected - they have turned-out exactly as claimed in the sense that almost all the world has taken the side of Satan, including most (almost all) self-identified-Christians!
The inverted-fake-Christians (who follow the ideology of The World) persecute the few remaining real followers of Christ, in the name of Jesus!
But how to fight our side in the spiritual war? Primarily by thinking. By primary thinking.
Most of thinking is passive and shallow and Of The World; either being mere habits of association - drilled by socialization and propaganda, or externally imposed concepts and 'facts'. Small wonder that so many people regard thinking as unimportant and actions as the only 'real' activity.
That is exactly what They want you to believe!
While They regarding Your thinking as of ultimate importance, They want You to regard Your thinking as merely trivial, subjective, internal.
It is a strange aspect of these ultra-materialistic, globally-bureaucratic, corporate-dominated times - that real, primary thinking is probably the single most valuable force for good in the world, now.
Because such thinking is not 'in the head' or cut-off-from reality; but actual participation in the ultimate reality of divine creation and create-ing.
It turns-out to be a good deal more difficult to think properly, primarily, intuitively, from our true (and divine) selves, from the heart (rather than intellect or instinct) - yet that is what we most need to do to fight the hourly and daily spiritual battles in the war of good and evil, now and tomorrow.