There are only two sources of knowledge: intuition and witness.
Intuition is not “apprehension by the subsconscious”, “perception of the inner side of things”, “feeling of identification”, nor any similar babbling. It is the immediate perception of a presence.
A reasoning or logical demonstration is nothing but a chain of intuitive perceptions of identity or difference between propositions (present to the conscience)
Everything that is not intuitive knowledge is trust in witness. There is no third way of knowing. This IS NOT different in religion or science.