Our blank cards feature detailed drawings of great thinkers from history on the front. The right side of the card interior is blank, and a poignant quote from that thinker is included on the inside left. Envelopes are included with each card, and both the cards and envelopes are 100% recycled paper. Mail a little bit of history to a friend, or choose one of these as a perfect gift for your favorite critical thinker. Choose from 4 different greeting cards: Lincoln, John Stuart Mill, Ghandi, and Thoreau.