First, Siddhattha remembered his previous lives. Next, he saw how beings are reborn according to the law of Kamma. He saw that good deeds lead away from suffering to peace and happiness and bad deeds to more suffering. Then he saw that the origin of suffering is selfish desire, which arises from ignorance. Finally, he attained full freedom from selfishness and ignorance, which is called Nibbana. So, at the age of 35, Siddhattha Gotama became Buddha, the Supreme Enlightened One.