The quotations I’ve been looking through to include on the inspirational site we’re building range from dreadful (“Hem your blessings with gratitude so they don’t uravel”) to just plain unsuitable:

The basis of optimism is sheer terror.
Oscar Wilde (1854–1900)

Self-respect—The secure feeling that no one, as yet, is suspicious.
H.L. Mencken (1880–1956)

(The image is from Despair, Inc. Brilliant.)