Quotation:

 Oliver Wendell Holmes quotes (American Physician, Poet, Writer, Humorist and Professor at Harvard, 1809-1894)

 Denis Diderot quotes (French man of letters and philosopher, 1713-1784)

 Oliver Wendell Holmes quotes (American Physician, Poet, Writer, Humorist and Professor at Harvard, 1809-1894)

 Oliver Wendell Holmes quotes (American Physician, Poet, Writer, Humorist and Professor at Harvard, 1809-1894)

 Oliver Wendell Holmes quotes (American Physician, Poet, Writer, Humorist and Professor at Harvard, 1809-1894)

 Oliver Wendell Holmes quotes (American Physician, Poet, Writer, Humorist and Professor at Harvard, 1809-1894)

 Lao Tzu quotes (Chinese taoist Philosopher, founder of Taoism, wrote "Tao Te Ching" (also "The Book of the Way"). 600 BC-531 BC)

 Oliver Wendell Holmes quotes (American Physician, Poet, Writer, Humorist and Professor at Harvard, 1809-1894)

 Oliver Wendell Holmes quotes (American Physician, Poet, Writer, Humorist and Professor at Harvard, 1809-1894)

 Oliver Wendell Holmes quotes (American Physician, Poet, Writer, Humorist and Professor at Harvard, 1809-1894)

 Richard Moss quotes