He'd think to himself I'm the very same person who was lecturing about philosophy last week.

他会以为,我和上星期上哲学课的人,是同一个人。

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Maybe identity, as philosophers like to put it, maybe identity is contingent.

也许同一性,就像哲学家喜欢说的,也许同一性是偶然的

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Identity is not necessary, but contingent, as the philosophers put it."

同一性不是必然的,而是偶然的,就像哲学家们常说的

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