“If two equal weights have not the same centre of gravity, the centre of gravity of both taken together is at the middle point of the line joining their centres of gravity.”

Book 1, Proposition 4.
On the Equilibrium of Planes

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Greek mathematician, physicist, engineer, inventor, and ast… -287–-212 BC

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“The centre of gravity of a parallelogram is the point of intersection of its diagonals.”

Book 1, Proposition 10.
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“The centre of gravity of any cylinder is the point of bisection of the axis.”

Proposition presumed from previous work.
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“The centre of gravity of any cone is [the point which divides its axis so that] the portion [adjacent to the vertex is] triple”

of the portion adjacent to the base
Proposition presumed from previous work.
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“Opinion is like a pendulum and obeys the same law. If it goes past the centre of gravity on one side, it must go a like distance on the other; and it is only after a certain time that it finds the true point at which it can remain at rest.”

Vol. 2 "Further Psychological Observations" as translated in Essays and Aphorisms (1970), as translated by R. J. Hollingdale
Parerga and Paralipomena (1851), Counsels and Maxims

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