Making meaningful public pronouncements

Instead of the standard, mechanical and often meaningless "Good morning" and "How are you ?", each person could have a collection of (say 100) daily greeting cards each carrying a meaningful quotation, proverb, wish, short poem, joke, etc, that he hands to people he meets every day. These should provide stimulating thoughts for hope, work and cheerfulness. If people got into the habit of exchanging these cards we would never run out of stock.