The Buddha Dharma is not based on the fear of the unknown, but on the base on of facts which can be tested and verified by experience. Buddhism is rational and intensely practical.
Buddha, after attained enlightenment, He went to Loc Gia park (dear-park) at Isipatana (ChÜ Thiên ñ†a) to convert the Kondanna's brothers, His five former companions. At first, they did not listen to Him; but His appearance was spiritual beauty, His teaching was sweet and convincing, they soon turned and gave Him their closet attention and then became His disciples which earned them the Arahats state. His lecture to them was called The Four Noble Truths. These four truths represent the philosophy and the ethics of Buddhism. They are the foundations of Buddhism.