There are three teachers for everyone. The first are the Parents. They sacrifice their lives to give comfort to their children. Parents teach their children in a practical way by taking good care of them. The second teacher is the Preceptor who guides the student in exercising his discrimination and taking the right path towards realising the divinity within him. The third teacher is your own Conscience. This is divine and always helps one to take the correct decision. When anyone tries to commit a sinful act or speak an untruth, the Conscience revolts and warns him that he is not right.  (SSS Vol.27,  p. 130)