Some care is needed in using ...

Some care is needed in using Descartes\' argument. \
Some care is needed in using Descartes' argument. "I think, therefore I am" says rather more than is strictly certain. It might seem as though we are quite sure of being the same person to-day as we were yesterday, and this is no doubt true in some sense. But the real Self is as hard to arrive at as the real table, and does not seem to have that absolute, convincing certainty that belongs to particular experiences.
 Bertrand Russell

Quotes from the same author

Collective fear stimulates herd instinct, and tends to produce ferocity toward those who are not regarded as members of the herd.
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 Bertrand Russell
We may say, in a broad way, that Greek philosophy down to Aristotle expresses the mentality appropriate to the City State; that Stoicism is appropriate to a cosmopolitan despotism; that stochastic philosophy is an intellectual expression of the Church as an organization; that philosophy since Descartes, or at any rate since Locke, tends to embody the prejudices of the commercial middle class; and that Marxism and Fascism are the philosophies appropriate to the modern industrial state.
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 Bertrand Russell
To conquer fear is the beginning of wisdom.
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 Bertrand Russell
The happiness that is genuinely satisfying is accompanied by the fullest exercise of our faculties and the fullest realization of the world in which we live.
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 Bertrand Russell
Real life is, to most men, a long second best, a perpetual compromise between the ideal and the possible.
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 Bertrand Russell