I admire the man who exclaimed, “I have lost a day!” because he had neglected to do any good in the course of it…. – Author unknown, “Flowers of Literature,” 1803

The tragedy of life is not that it ends so soon, but that we wait so long to begin it. – Author unknown, sometimes attributed to W.M. Lewis

When we lose one we love, our bitterest tears are called forth by the memory of hours when we loved not enough. – Maurice Maeterlinck, Wisdom and Destiny, 1901, translated by Alfred Sutro

The bitterest tears shed over graves are for words left unsaid and for deeds left undone. – Harriet Beecher Stowe, Little Foxes, 1865