Descartes sat and meditated, and thus cogitoed--ergo sum, ergo sum.
Doubting all he took as granted forced him to conclude--ergo sum, ergo sum.

It took four more meditations for the world to bloom--
proving God deposed deception (with distinctness too!).

The path of all modern thinking starts with Descartes' turn--ergo sum, ergo sum. . .

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