This is your sentence.

It goes into effect this very hour, but becomes null and void the moment you come to me with acknowledgments of penitence for the past, and promises of implicit obedience for the future." Elsie stood like a statue; her hands clasped, and her eyes fixed upon the floor.

She had grown very pale while her father was speaking, and there was a slight quivering of the eyelids and of the muscles of the mouth, but she showed no other sign of emotion.
"Did you hear me, Elsie ?" he asked.
"Yes, papa," she murmured, in a tone so low it scarcely reached his ear.
"Well, have you anything to say for yourself before I send you back to your room ?" he asked in a somewhat softened tone.
He felt a little alarmed at the child's unnatural calmness; but it was all gone in a moment.

Sinking upon her knees she burst into a fit of passionate weeping.

"Oh! papa, papa!" she sobbed, raising her streaming eyes to his face, "will you never, _never_ love me any more ?--must I never come near you, or speak to you again ?" He was much moved.
"I did not say _that_, Elsie," he replied.