“It is clear that the baptism with the Holy Spirit is always something clear and unmistakable, something which can be recognized by the person to whom it happens and by others who look on at this person. This is obviously a most vital and important principle. Those, of course, who tend to identify the baptism of the Holy Spirit with regeneration, and say that all who become Christians receive the baptism of the Holy Spirit on conversion naturally minimize this, as they must do, of necessity. Regeneration is something unconscious, not experimental; and the great point is that it is a mysterious, miraculous act worked in the depths and the vitals of the soul, and no man can tell you the moment when he was regenerated. Everybody is agreed about that – that regeneration is non-experimental. You later begin to discover the fact that you have been made regenerate and give evidence of it.
“But now here we are dealing with something which is very different. The very essence of this is that it is conscious, that it is experimental, obvious, plain, and clear; not only to the recipient but also to those who are familiar with him…I think the bible makes it perfectly clear, it makes it quite beyond any doubt, that this is something essentially experimental, which involves a mystical experience, to use such a term.”
Martyn Lloyd Jones, Joy Unspeakable