It is of paramount importance that the student, or the interested reader, understand that behind and within the outer or exoteric literatures of each and every great philosophy, lesson and instruction, there is a heart or core of more mystical teaching, which, indeed, is the real substance, clothed and all to frequently hidden by the outer exoteric literary garment or veil.
This is, in fact, the body of esoteric teaching which is never promulgated publicly, a reticence or a reserve not inspired by motives arising from intellectual selfishness, nor because the part withheld regards authenticity, but simply because, without some adequately prolonged study, no one could properly understand Freemasonry!