Some people are successful in mastering life, while others permit life to master them.
The split in you is very clear. There is a part of you that knows what it should do, and a part of you that knows what it should not do. If passion drives you, let reason hold the reins.
Once you understand these opposing forces warring within you, you come to a knowledge of the truth, and you no longer remain a slave. A clear understanding of this will make you the master of your life.
Are you controlled by your thoughts or are you controlling your thoughts? If you do not conquer self, you will be conquered by self.
If you are ruled by your mind you are a king, if by your body, a slave.