It is easy to grasp The Secret intellectually: The law of attraction attracts experiences according to the way we think and feel. Positive thoughts and feelings invite happiness, health, and wealth. Negative thoughts and feelings do the opposite.
Modern psychology emancipated itself from philosophy in the second half of the 19th century to find more effective ways of dealing with mental abnormalities. It made its first public appearance as Sigmund Freud’s psychoanalysis.