Quote taken from American Catholic Website:
All her life St. Thérèse suffered from illness. As a young girl she underwent a three-month malady characterized by violent crises, extended delirium and prolonged fainting spells. Afterwards she was ever frail and yet she worked hard in the laundry and refectory of the convent. Psychologically, she endured prolonged periods of darkness when the light of faith seemed all but extinguished. The last year of her life she slowly wasted away from tuberculosis. And yet shortly before her death on September 30 she murmured, "I would not suffer less."
Truly she was a valiant woman who did not whimper about her illnesses and anxieties. Here was a person who saw the power of love, that divine alchemy which can change everything, including weakness and illness, into service and redemptive power for others. Is it any wonder that she is patroness of the missions? Who else but those who embrace suffering with their love really convert the world?
Such an attachment and attraction to my dear patron saint in Heaven. As I go through my own personal and internal suffering, may Love conquer the evil and sadness of the world today through the intervention of the Holy Angels and Saints in Heaven. May a shower of roses come from Heaven not only to my family and friends who need your intercession dear sweet Little Flower, but that the world be granted peace and much Love and Divine Mercy in the hearts of the wretched and despaired.