Dr. Zimbardo of the famous Zimbardo experiment

Dr. Zimbardo:  "If you don't stand for something, you'll fall for anything. As basic human values are being strained, distorted and lost in our rapidly evolving culture, illusions and promissory notes are too readily believed and bought--without reality validation or credit checks."

You can see here why learning straight Torah is important. If one does not know what the Torah says he can fall for any one of the demonic Jewish cults that are out there. If one's time is limited, I suggest at least learning Shimshon Refael Hirsh's Horev or Rav Kook's books which give a good introduction to Torah. [Rav Kook's books are usually considered more deep than Rav Hirsh.]