In the past week I have seen thoughtforms come up in the chat twice. So, what I am doing is taking a moment to explain what a thoughtform is.
I sat down and really started to think about how to explain it. So lets start with the simplest explanation. A thoughtform is what is sent out when one casts magick. It is soulless energy sent out from a person in order to do something specific. This is the conscious thoughtform. You can use it for good or bad, it doesn't matter.
However there are cases where people create thoughtforms unintentionally. Lets use this as an example, say someone bottles up all of their emotions and then all of the sudden they are happy. But you notice something, all of the people they come into contact with are experiencing the emotions that the person has bottled up. This person who no longer has all of these emotions bottled up will tell you that they feel better when in fact they do!
Because they have created energy that was so intense that it manifested itself therefore it becomes a being without a soul that can be controlled and manipulated if the person knows how to do so. Hence the reason we can intentionally create a thoughtform with magick and it is the energy sent when using magick.
To explain further think of it like this: A thought becomes a desire, a desire becomes will, will is energy. Went sent out that energy manifests to make the will of the person happen. That energy can be known as a thoughtform.