Who said "I never lost a pound of flesh, nor a pound of spirit"?

This quote is attributed to Henry David Thoreau.

I never lost a pound of flesh, nor a pound of spirit - Henry David Thoreau

"I never lost a pound of flesh, nor a pound of spirit"

Henry David Thoreau Strength

Character in Walden

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"I went to the woods because I wished to live deliberately, to front only the essential facts of life"

"Simplicity, simplicity, simplicity!"

"The mass of men lead lives of quiet desperation"

"A man is rich in proportion to the number of things he can afford to let alone"

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."