"Time is painted with a lock before, and bald behind, signifying thereby that we must take time by the forelock; for, when it is once past, there is no recalling it."

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Do you know that disease and death must needs overtake us, no matter what we are doing?... what do you wish to be doing when it overtakes you?... If you have anything better to be doing when you are so overtaken, get to work on that.

— Epictetus