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

Never forget that you must die; that death will come sooner than you expect… God has written the letters of death upon your hands. In the inside of your hands you will see the letters M.M. It means “Memento Mori” — remember you must die. – J. Furniss, Tracts for Spiritual Reading

There was George, throwing away in hideous sloth the inestimable gift of time; his valuable life, every second of which he would have to account for hereafter, passing away from him, unused…. sprawling there, sunk in soul-clogging oblivion. – Jerome K. Jerome, Three Men in a Boat (To Say Nothing of the Dog), 1889

There is a bunch of things we mean to do, and life is the time we spend meaning to do them. – Robert Brault, rbrault.blogspot.com