The supreme misfortune is when theory outstrips performance

Nature varies the seed according to the variety of the things she desires to produce in the world.

Men of lofty genius when they are doing the least work are most active.

Just as a well-filled day brings blessed sleep, so a well-employed life brings a blessed death.

Weight is caused by one element being situated in another; and it moves by the shortest line towards its centre, not by its own choice, not because the centre draws it to itself, but because the other intervening element cannot withstand it.

Who would believe that so small a space could contain the images of all the universe?

It is an acknowledged fact that we perceive errors in the work of others more readily than in our own.