Liberty

 "... make not liberty an occasion to the flesh, but by charity of the spirit serve one another."

Galatians 5:13,The Holy Bible, DRV

“Liberty, the highest of natural endowments, being the portion only of intellectual or rational natures, confers on man this dignity-that he is "in the hand of his counsel" and has power over his actions.  But the manner in which such dignity is exercised is of the greatest moment, inasmuch as on the use that is made of liberty the highest good and the greatest evil alike depend.  Man, indeed, is free to obey his reason, to seek moral good, and to strive unswervingly after his last end.  Yet he is free also to turn aside to all other things; and, in pursuing the empty semblance of good, to disturb rightful order and to fall headlong into the destruction which he has voluntarily chosen.”

LIBERTAS - On the Nature of Human Liberty,
Encyclical Letter of Pope Leo XIII, #1

“God created man a rational being, conferring on him the dignity of a person who can initiate and control his own actions. God willed that man should be 'left in the hand of his own counsel,' so that he might of his own accord seek his Creator and freely attain his full and blessed perfection by cleaving to him."

Man is rational and therefore like God; he is created with free will and is master over his acts.

Catechism of the Catholic Church, #1730

“Freedom is the power, rooted in reason and will, to act or not to act, to do this or that, and so to perform deliberate actions on one's own responsibility.  By free will one shapes one's own life.  Human freedom is a force for growth and maturity in truth and goodness; it attains its perfection when directed toward God, our beatitude.

As long as freedom has not bound itself definitively to its ultimate good which is God, there is the possibility of choosing between good and evil, and thus of growing in perfection or of failing and sinning.  This freedom characterizes properly human acts. It is the basis of praise or blame, merit or reproach.

The more one does what is good, the freer one becomes.  There is no true freedom except in the service of what is good and just. the choice to disobey and do evil is an abuse of freedom and leads to "the slavery of sin."

Catechism of the Catholic Church, #1731-#1733

“The right to the exercise of freedom, especially in religious and moral matters, is an inalienable requirement of the dignity of man.  But the exercise of freedom does not entail the putative right to say or do anything.”

Catechism of the Catholic Church, #1747