With failing hopes and increasing experience of the complexity of human struggle, Catherine clung to her aim until the end. There was no touch of pusillanimity in her heroic spirit. As with deep respect we follow the Letters of the last two years, and note their unflagging alertness and vigour, their steady tone of devotion and self-control, we realise that to tragedy her spirit was dedicate. Her energy of mind was constantly on the increase. Still, it is true, she wrote to disciples near and far long, tender letters of spiritual counsel--analyses of the religious life tranquilly penetrating as those of an earlier time. But her political correspondence grew in bulk. It is tense, nervous, virile. It breathes a vibrating passion, a solemn force, that are the index of a breaking heart. Not for one moment did Catherine relax her energies. From 1376, when she went to Avignon, she led, with one or two brief intermissions only, the life of a busy woman of affairs. But within this outer life of strenuous and, as a rule, thwarted activities, another life went on--a life in which failure could not be, since through failure is wrought redemption. From the days of her stigmatization, which occurred in 1375 at Pisa, Catherine had been convinced that in some special sense she was to share in the Passion of Christ, and offer herself a sacrifice for the sins of Holy Church. Now this conception deepened till it became all-absorbing. In full consciousness of failing vital powers, in expectation of her approaching death, she offered her sufferings of mind and body as an expiation for the sins around her. By word of mouth and by letters of heartbroken intensity she summoned all dear to her to join in this holy offering. Catherine's faith is alien to these latter days. Yet the psychical unity of the race is becoming matter not only of emotional intuition, but established scientific fact: and no modern sociologist, no psychologist who realizes how unknown in origin and how intimate in interpenetration are the forces that control our destiny, can afford to scoff at her. She had longed inexpressibly for outward martyrdom. This was not for her, yet none the less really did she lay down her life on the Altar of Sacrifice. The evils of the time, and above all of the Church, had generated a sense of unbearable sin in her pure spirit; her constant instinct to identify herself with the guilt of others found in this final offering an august climax and fulfilment.