Harriet Beecher Stowe: The bitterest tears shed over graves are for words left unsaid and deeds left undone.

Anais Nin: Love never dies a natural death. It dies because we don’t know how to replenish its source. It dies of blindness and errors and betrayals. It dies of illness and wounds; it dies of weariness, of witherings, of tarnishings.

Bertrand Russell: A sense of duty is useful in work, but offensive in personal relations. People wish to be liked, not be endured with patient resignation.

Henry David Thoreau: Love must be as much a light as it is a flame.

Oliver Wendell Holmes, Sr.: Insanity is often the logic of an accurate mind overtasked.

John Milton:  The mind is its own place, and in itself, can make heaven of Hell, and a hell of Heaven.