Let only my sin, sinews and bone remain and let the flesh and blood in my body dry up; but not until I attain the supreme Enlightenment will I give up this seat of meditation.
Who do you think you are! You will never reach supreme enlightenment.
I cannot do this all night, earth give me strength!
After coming to the realization that living the life of the ascetics was not going to achieve enlightenment, Siddhartha decided to reach the so called middle way. He found a suitable place to meditate (under a peepul tree) and faced toward the East and vowed not to leave.
Most people think that The Evil One, Mara, appeared and tried to stop him from reaching enlightenment and he tried various different tactics.
NO FIXED SELF
Mara tried with everything he had, sending all his assets in order to shake Siddhartha out of meditation. Some people suggest that at one point Mara himself came to fight Siddhartha. However, through this mental battling Siddhartha needed help from the earth and then therefore he reached to the ground and asked for help.
I understand it all now. I understand pain and suffering. I am the awakened one..
When Siddhartha touched the ground he became enlightened and Mara was vanquished. Throughout this new experience Siddhartha had 'The Three Watches of the Night'. The first one being that he gained all knowledge of his previous lives.
Secondly, he came to understand the repeating cycle of life, death and rebirth. He understood that beings were born depending on their Kamma (their actions) and the idea there there is no fixed self.
Finally, he came to comprehend why suffering happens and how to over come it. After his enlightenment, he became known as the Buddha. He then originally wanted to stay in the forest and bask in this new knowledge but something compelled him to go round to all of his previous friends and teach them the ways.