The Jedi of Star Wars are similiar to the Guardians of Plato's Republic. Plato says that the perfect government needs a group to guard peace and justice. In the World of Star Wars, the Jedi do just that. They operate upon a set of virtues in order to keep the peace.

One part of training to become a Jedi involves intense physical training. This is not just to grow stronger physicially, but also to grow stronger mentally. It is good to train your body to obey your mental commands in this way. Physical training can help you develop courage and endurance, but if its taken too far it becomes too much about the physical gain and not enough about the mental. Then you become savage and animalistic.
Endurance requires self control, but provides you with the ability to overcome difficulties no matter how frustrating they may be.

Another part of training to become a Jedi involves learning physical balance, a balance between emotions also called the Golden Mean. A balanced action responds to a particular situation at the right time, in relation to the right people, with the right motive, and in the right way. You can fear too much just as you can fear to little. The in between is where the Golden Mean is located. It is also called virtue.
Courage is the virtue in between fearing too much and fearing too little. Something can only be determined to be courageous when there is a decision and a just cause for it. Even though Yoda warns about fear, anger, and aggression, they can be good if controlled by reason. An example would be being angry at the way people are treated. This anger could inspire you to take action but if you do not use reason you could take your anger too far. Sometimes it can be hard to bring reason into your emotional decisions because that requires a calm mind. A calm mind is required to distinguish good decisions from rash decisions.

A Jedi Knight also needs self-knowledge or an understanding of personal fear and other emotions and relationships. This self-knowledge can then be used to free yourself from weakness by confronting what you fear or despise. Self-Knowledge helps you to overcome ignorance as well. Integrity ,or the ability to discern what is right from wrong and act on what you discern regardless of personal cost, is a value required to keep you from giving in to evil. Though other may hurt you, you must also forgive so another value that a Jedi Knight should possess is
forgiveness-Ability to forgive transgressions made against you so that you no longer need to carry around the burderns of resentment and hostility.

The Jedi are forbidden to be involved in a romantic relationship because having private attachment may conflict with their devotion to the community. Instead the Jedi value compassion, or selfless love, involving a deep cherishing concern for each indivisual. They believe everyone has
intrinsic value- valued for their own sake, regardless of what they have done or their capacity to do anything worth while. Another type of love shown by Jedi is
loyalty-unwavering commitment to the people you value. It involves the subordination of your private interests in favor of their more pressing needs.

One issue involving the Jedi is brainwashing. The Jedi can influence the weak minded with Jedi mind tricks, but is this considered wrong. A Jedi wouldn't think so, but anyone who brainwashes would believe they are doing it for a greater purpose. Plato brought up brainwashing in the Republic and he determined that the weak minded are always being manipulated by other people anyway so it is ok to brainwash them. Of course the ancient Greeks couldn't use Jedi mind control, but they could make myths to infuence the way people think.