Self-knowledge sets you free.
If knowing yourself is being sure that you are using your free will to fulfill your desires and doing what you really want, without any influence or opinion of others, it is only you and your desire.
The power of being, having and doing what you want, within your limits, your capacity and conditions, even if you can not at that moment, know yourself to the point of doing what is necessary to do what is good for you, without regrets or situations that were not caused by your choice.