Hi Marcin!
Where are they coming from and going to?
All in all, there's no rhyme or reason to most thoughts. The stream of thoughts is akin to boarding trains. Once you step off of one, another is prompt to follow. Thoughts seem to come out of nothing(ness) and return there as well.
Did you do anything to make a particular thought or thoughts appear?
No, they are entirely spontaneous. Certain thoughts are triggered by other thoughts, so by the same virtue, thoughts are also triggered by external environment in the same way. Seeing an object such as an apple and imagining one will send me down the same line of thinking unless there was something noteworthy about the object in either form.
Could you have done anything to make a different thought appear at that exact moment
instead?
No. Following the previous question, they are spontaneously manifested either by a trigger or mind's natural functioning.
Can you predict your next thought?
No. If left to it's own devices, the mind is a series of thoughts going off on tangents to whatever object it's interested in the most at the time.
Can you select from a range of thoughts to have only pleasant thoughts?
Same as the previous two questions. Thoughts are spontaneous in nature and one can either go with the train or choose not to board it(get off anywhere in midst of the journey if one is aware of it).
Can you choose not to have painful, negative or fearful thoughts?
No, but ultimately, there is no necessity to try and avoid them. It is all about investment in the form of belief and attention.
Can you pick and choose any kind of thought?
I'm not sure what the angle is on this question, but I will say that to the degree of my conscious intention to manifest a thought, I can manifest it. Although ultimately it's the same trap the previous questions allude to, because in order for me to even want to manifest a certain though, there has to be an impulse to want to generate that thought, which is also a thought. And then one boards a train again, although there might be a greater sense of control of where it heads. The closest I can come to describing what free will is is those little conscious moments driven by an inner impulse. Call it intuition or whatever else.
Is it possible to prevent a thought from appearing?
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No. This is paradoxical in nature. Any intention is of the nature of thought. Even one to prevent a thought.
All the best,
Yev