This was originally a reply on the thread it was split off here to avoid derailing the original thread; Keep an eye open to the teachings you listen to in these last days.
For each of these 'teachers' there is a trap. So many, myself included spend time studying the writing of other men. Naturally, there are going to be those we agree with one way or another. We tend to form our own understanding of what these men write / teach. I personally refer to these things as 'derived doctrine'.
Derived doctrine has it's roots in scripture, but relies on an external explanation to make it work. For instance, the RCC doctrine of purgatory can be supported by certain scripture, but is not in scripture it's self and is therefore FALSE. Many doctrines we see in these end times fall along these lines.
The thing I once believed about the timing of the Lord's return was a 'derived doctrine' and while it made sense if you took it into scripture, it never seemed to be in scripture on it's own.
One of the ways to see this is if the explanations have to be more complicated then they should be, or if certain scripture has to be taken slightly out of context to make something fit (like when someone has to 'tweak' work meanings to make something fit, often citing something about the 'original language' or using multiple translations.
Blessings to all who follow this thread, may we all be keen to see the error that we are being sold. It is not through our own reason we will see it, but only by the Holy Spirit we are protected.