But I cannot forget that, at other times I have been deceived in sleep by similar illusions; and, attentively considering those cases, I perceive so … - René Descartes

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But I cannot forget that, at other times I have been deceived in sleep by similar illusions; and, attentively considering those cases, I perceive so clearly that there exist no certain marks by which the state of waking can ever be distinguished from sleep, that I feel greatly astonished; and in amazement I almost persuade myself that I am now dreaming.

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About René Descartes

René Descartes (March 31, 1596 – February 11, 1650) was a highly influential French philosopher, mathematician, physicist and writer. He is known for his influential arguments for substance dualism, where mind and body are considered to have distinct essences, one being characterized by thought, the other by spatial extension. He has been dubbed the "Father of Modern Philosophy" and the "Father of Modern Mathematics." He is also known as Cartesius.

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Also Known As

Alternative Names: Descartes Cartesius Renatus Cartesius Renė Dekartas
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Additional quotes by René Descartes

"In everyday life we must often act without delay, it is a most certain truth that when it is not in our power to discern the truest opinions, we must follow the most probable." (Discourse III, AT VI: 25/CSM I: 123)

[Descartes discusses a traveler lost in a forest to illustrate this. The traveler is lost, and he does not know how to get out of the woods. Descartes’ advice is that the traveler should pick a route, even if it is uncertain, and resolutely stick to it:

"Keep walking as straight as he can in one direction, never changing it for slight reasons even if mere chance made him choose it in the first place; for in this way, even if he does not go exactly where he wishes, he will at least end up in a place where he is likely to be better off than in the middle of a forest." (Ibid.)]

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I doubt;
Therefore, I think
Therefore, I am.

I see;
I take in the colours around me.
The patterns, the lights, the rainbows.
I see the night and the stars that glow.

I dream;
Therefore, I think.
Therefore, I am.

I smell;
The perfumes, the roses.
The stench, the rotten and the putrid.
The aromas and delicacies;
Cooking.

I inhale;
The green, the forest, the trees.
Therefore, I think.
Therefore, I am.

I hear;
The noises. The people, the cheer.
The wails, the screams, the tears.
The rejoicing.
The laughter, and happiness.

I listen;
Therefore, I think.
Therefore, I am.

I taste;
The sweetness, the fire.
The treats, and savoury delights.
The burnt, the spoilt and the tasteless.
The sourness and the bitterness.

I eat;
Therefore, I think.
Therefore, I am.

I speak;
Short messages. Long speeches.
Quiet whispers. Bellowing noises.

I scream;
Therefore, I think,
Therefore, I am.

I feel;
The despair.
The anguish, the fear.
The pricks, the cuts, the injuries.
The joy. The pride. The seething.
The envy, greed, and jealousy.
The cold, the heat and the shivering.
The pain, the sickness, the ageing.

I die;
Therefore, I lived.
Therefore, I was.

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