Eureka! (I have found it!).

Equal weights at equal distances are in equilibrium and equal weights at unequal distances are not in equilibrium but incline towards the weight which is at the greater distance.

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

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

The diameter of the earth is greater than the diameter of the moon and the diameter of the sun is greater than the diameter of the earth.

Rise above oneself and grasp the world.

Having been the discoverer of many splendid things, he is said to have asked his friends and relations that, after his death, they should place on his tomb a cylinder enclosing a sphere, writing on it the proportion of the containing solid to that which is contained.