(more links added as I remember them)

Good humor is one of the best articles of dress one can wear in society.
-- William Makepeace Thackeray, 19th century English novelist

Listen or thy tongue will keep thee deaf.
-- American Indian Proverb

Imagination is more improtant than knowledge.
Knowledge is limited. Imagination encircles the world.
-- Albert Einstein

I am not afraid of tomorrow,
for I have seen yesterday and I love today.
-- William Allen White (American journalist 1868 - 1944)

Outside of a dog a book is man's best friend.
Inside a dog it's too dark to read.
--Groucho Marx