today and tomorrow; today or tomorrow; in a day or two; very soon
what happens to one today may happen to another tomorrow; misfortunes can happen to anyone
a bird in the hand is worth two in the bush; (lit.) fifty today is better than a hundred tomorrow
a stitch in time saves nine; (lit.) one needle today, ten needles tomorrow
life is transient; life is uncertain; memento mori; one's time (of death) is nigh; one's days are numbered