To live is to act. That is, all living objects are always taking action: any object which is not taking action is not alive. To be conscious is to have a will. That is, all conscious objects have a will, and any object without a will is not conscious.

A will is a set of answers to the set of all questions of action, where a question of action is a question of the type "given circumstance X, what action would you take?". That is, applying pythonic list comprehension logic for simplicity, a will is a list equal to [ your_answer_to("given circumstance X, what action would you take?") for X in set_of_all_circumstances ].

To act in accordance with your own will is to take the action which is your own answer to the appropriate question of action when presented with circumstance X. To act not in accordance with your own will is to take an action which is not your own answer.

Of your actions, a part are in accordance with your own will, and the remainder are not. Equivalently, of your whole self, a part is free, and the remainder is not. You are as free as your actions are in accordance with your own will. You will never act completely in accordance with your own will, so you will never be completely free.

To act in accordance with another person's will is to be that person's constituent in some group. That is, if a person answers questions of action on your behalf, then that person is your representative in some group.

To be represented is necessarily to be less free, because being represented by a person implies you act in accordance with that person's will, and that person's will is inevitably not always your own. If you are completely represented by others, then you have no freedom.

Tyranny is representation without consent. That is, if a person represents you against your wishes, then that person is a thief of freedom, and by definition tyrannical.

Liberty is the right to delegate your freedom to representatives of your own choosing. To apply liberty is to consent to having another person answer questions of action on your behalf. Guaranteeing a minimum amount of freedom therefore guarantees a maximum amount of liberty. No one is at liberty to be a slave.