Speaking of the event of St Maximilian's death, Pope St John Paul II said:
All this happened in the concentration camp at Auschwitz where during the last war some four million people were put to death, including the Servant of God, Edith Stein (the Carmelite Sister Teresa Benedicta of the Cross), whose cause for beatification is in progress at the competent Congregation. Disobedience to God-the Creator of life who said, "Thou shalt not kill"-caused in that place the immense holocaust of so many innocent persons. And so at the same time, our age has thus been horribly stigmatized by the slaughter of the innocent.
Father Maximilian Kolbe, himself a prisoner of the concentration camp, defended in that place of death an innocent man's right to life. Father Kolbe defended his right to life, declaring that he was ready to go to death in the man's place, because he was the father of a family and his life was necessary for his dear ones. Father Maximilian Maria Kolbe thus reaffirmed the Creator's exclusive right over innocent human life. He bore witness to Christ and to love. For the Apostle John writes: "By this we know love, that he laid down his life for us. And we ought to lay down our lives for the brethren" (1 John 3:16).I have added the italics to try to draw out how John Paul II's words indicate a way of understanding the intention of Pope Francis' idea of an "offer of life". Later in the homily, this becomes clearer still:
Men saw what happened in the camp at Auschwitz. And even if to their eyes it must have seemed that a companion of their torment "dies," even if humanly speaking they could consider "his departure" as "a disaster," nevertheless in their minds this was not simply "death." Maximilian did not die but "gave his life...for his brother." In that death, terrible from the human point of view, there was the whole definitive greatness of the human act and of the human choice. He spontaneously offered himself up to death out of love.
And in this human death of his there was the clear witness borne to Christ: the witness borne in Christ to the dignity of man, to the sanctity of his life, and to the saving power of death in which the power of love is made manifest.Pope Francis characterises the offer of life as "a free and voluntary offer of life and heroic acceptance propter caritatem of a certain and untimely death". Pope John Paul II, to an extent foreshadowing Pope Francis' motu proprio, assimilated St Maximilian's offer of his life to martyrdom and proclaimed that St Maximilian was to be recognised, not just as a confessor of the faith, but as a martyr for the faith.
Many years ago now I recall speaking and writing about Archbishop Oscar Romero and Fr Jerzy Popieluszko as "martyrs for the truth about man". I think we can see in both of these great figures examples of the "offering of life" which Pope Francis has now established as a way to beatification.