He who cannot obey himself will be commanded. That is the nature of living creatures.

To conquer oneself is a greater victory than to conquer thousands in a battle.

It is a self-deception of philosophers and moralists to imagine that they escape decadence by opposing it. That is beyond their will; and, however little they acknowledge it, one later discovers that they were among the most powerful promoters of decadence.

You will never have a greater or lesser dominion than that over yourself...the height of a man's success is gauged by his self-mastery; the depth of his failure by his self-abandonment. ...And this law is the expression of eternal justice. He who cannot establish dominion over himself will have no dominion over others.

Freedom is the will to be responsible to ourselves

If I want to be great I have to win the victory over myself... self-discipline.