“I wish to say what I think and feel today, with the proviso that tomorrow perhaps I shall contradict it all.”
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Ralph Waldo Emerson 727
American philosopher, essayist, and poet 1803–1882Related quotes

“Drink today, and drown all sorrow;
You shall perhaps not do't tomorrow.”
Act II, scene ii.
Rollo, Duke of Normandy, or The Bloody Brother, (c. 1617; revised c. 1627–30; published 1639)

“Believe me, wise men don't say ‘I shall live to do that’, tomorrow's life is too late; live today.”
Non est, crede mihi, sapientis dicere ‘Vivam’:
Sera nimis vita est crastina: vive hodie.
I, 15.
Variant translations:
'I'll live to-morrow', 'tis not wise to say:
'Twill be too late to-morrow—live to-day.
Tomorrow will I live, the fool does say;
Today itself's too late; the wise lived yesterday.
Epigrams (c. 80 – 104 AD)

“Never say goodbye,
You say tomorrow's another day,
All I know is we're here today.”
"Never Say Goodbye" on It's Alright (I See Rainbows) (1982).
Context: Never say goodbye,
You say tomorrow's another day,
All I know is we're here today. I've got nightmares I could never share with you,
The kind that keeps me up all night.
So hold me tight till the room is light
And tell me that it's all right.

“I didn't get where I am today by worryin' about how I'd feel tomorrow.”
They Call Me Tater Salad

As quoted in "The Passing of a Great Mind" by Clay Blair, Jr., in LIFE Magazine (25 February 1957), p. 96

Speaking to an Iranian Newspaper in September 1977, as quoted in Pakistan, a Dream Gone Sour http://www.defencejournal.com/dec98/pakdream.htm (1997) by Roedad Khan.
“I am in yesterday, today. And tomorrow? In tomorrow I was.”
Estoy en el ayer, en el hoy. ¿Y en mañana? En el mañana estuve.
Voces (1943)