Constant and painful exertion

"The composure of mind with which I have brought myself at present to consider the matter, the consolation that I have been willing to admit, have been the effect of constant and painful exertion; they did not spring up of themselves; they did not occur to relieve my spirits at first. No, Marianne. Then, if I had not been bound to silence, perhaps nothing could have kept me entirely—not even what I owed to my dearest friends—from openly showing that I was very unhappy."

Sense and Sensibility, volume 3, chapter 1

Elinor to Marianne