“Tomorrow, I shall no longer be here.”
Last words, as quoted in Famous Last Words: The Ultimate Collection of Finales and Farewells (2004) by Laura Ward and Robert Allen; reported to have been said to his secretary Jean de Chavigny
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Nostradamus 6
French apothecary and reputed seer 1503–1566Related quotes

“I no longer care about the mistakes of yesterday. I care about coping with tomorrow … together.”
Superman
Kingdom Come (1996)
Context: I no longer care about the mistakes of yesterday. I care about coping with tomorrow … together.
The problems we face still exist. We're not going to solve them for you... we're going to solve them with you … not by ruling above you … but by living among you. We will no longer impose our power on humanity. We will earn your trust … using the wisdom left as his legacy. I asked him to choose between humans and superhumans. But he alone knew that was a false division … and made the only choice that ever truly matters … he chose life … in the hope that your world and our world could be one world once again.

“I'll be here tomorrow
If I can make it through today.”

Monotony http://www.cavafy.com/poems/content.asp?id=96&cat=1
Collected Poems (1992)

“The scenes of tomorrow no longer concern me; they call for other artists: your turn, gentlemen!”
Book XLII: Ch. 18: A summary of the changes which have occurred around the globe in my lifetime
Mémoires d'outre-tombe (1848 – 1850)
Context: New storms will arise; one can believe in calamities to come which will surpass the afflictions we have been overwhelmed by in the past; already, men are thinking of bandaging their old wounds to return to the battlefield. However, I do not expect an imminent outbreak of war: nations and kings are equally weary; unforeseen catastrophe will not yet fall on France: what follows me will only be the effect of general transformation. No doubt there will be painful moments: the face of the world cannot change without suffering. But, once again, there will be no separate revolutions; simply the great revolution approaching its end. The scenes of tomorrow no longer concern me; they call for other artists: your turn, gentlemen!
As I write these last words, my window, which looks west over the gardens of the Foreign Mission, is open: it is six in the morning; I can see the pale and swollen moon; it is sinking over the spire of the Invalides, scarcely touched by the first golden glow from the East; one might say that the old world was ending, and the new beginning. I behold the light of a dawn whose sunrise I shall never see. It only remains for me to sit down at the edge of my grave; then I shall descend boldly, crucifix in hand, into eternity.

“Faith, sir, we are here today, and gone tomorrow.”
The Lucky Chance, Act IV (1686).