Reading is the sole means by which we slip, involuntarily, often helplessly, into another's skin, another's voice, another's soul.
— Joyce Carol Oates

Genius is no more than childhood recaptured at will, childhood equipped now with man's physical means to express itself, and with the analytical mind that enables it to bring order into the sum of experience, involuntarily amassed.
Charles Baudelaire involuntarily quote

By his machines man can dive and remain under water like a shark; can fly like a hawk in the air; can see atoms like a gnat; can see the system of the universe of Uriel, the angel of the sun; can carry whatever loads a ton of coal can lift; can knock down cities with his fist of gunpowder; can recover the history of his race by the medals which the deluge, and every creature, civil or savage or brute, has involuntarily dropped of its existence; and divine the future possibility of the planet and its inhabitants by his perception of laws of nature.
— Ralph Waldo Emerson

If there be no nobility of descent in a nation, all the more indispensable is it that there should be nobility of ascent -- a character in them that bear rule, so fine and high and pure, that as men come within the circle of its influence, they involuntarily pay homage to that which is the one pre-eminent distinction, the Royalty of Virtue.
— Henry Codman Potter

Unquestionably, it is possible to do without happiness; it is done involuntarily by nineteen-twentieths of mankind.
— involuntarily quotation by John Stuart Mill