Give me but a firm spot on which to stand, and I shall move the earth.

The centre of gravity of any parallelogram lies on the straight line joining the middle points of opposite sides.

Eureka! (I have found it!).

Give me a place to stand, and a lever long enough, and I will move the world.

I am persuaded that this method [for calculating the volume of a sphere] will be of no little service to mathematics. For I foresee that once it is understood and established, it will be used to discover other theorems which have not yet occurred to me, by other mathematicians, now living or yet unborn.

Two magnitudes whether commensurable or incommensurable, balance at distances reciprocally proportional to the magnitudes.

The centre of gravity of any cylinder is the point of bisection of the axis.