One of the most common of ancient heresies was Gnosticism, which is still very much with us. Gnosticism held that salvation is from the material or physical world, from flesh, and it comes through knowledge.
In August of 1909, Sigmund Freud embarked upon a fateful journey. He along with his psychoanalytic heir apparent, Carl Gustav Jung, had been invited by G. Stanley Hall, the father of American psychology, to give a series of lectures at Clark University in Worcester, Massachusetts.
Gnosticism was birthed as a pseudo-Christian heresy in the mid-first century by Simon Magus, a Samaritan sorcerer ("magus" means magician) of astonishing ability (Ac. 8:4- 24).