Martyrdom is the ultimate freedom.

Here is a short account of St. Maximilian Kolbe’s free choice:

It is important to point out that the grace of God does not do away with or suffocate the liberty of the one facing martyrdom, but on the contrary, improves and exalts it: The martyr is an extremely free person, free in the face of power, of the world; a free person, who in one definitive act gives his whole life to God, [...] sacrifices his own life to be totally associated to Christ's sacrifice on the cross. In a word, martyrdom is a great act of love in response to the immense love of God." Benedict XVI, Aug 17, 2010.

We recommend this awesome little book: Interior Freedom by Jacques Philippe. It is very enlightening, especially in the context of today's culture which seems to have lost its moral compass.