"Trilateral figures are those contained by three straight lines, quadrilateral those contained by four, and multilateral those contained by more than four straight lines."

"Let it be granted that a straight line may be drawn from any one point to any other point."

"That which is without parts has no magnitude."

"A plane surface is a surface which lies evenly with the straight lines on itself."

"The laws of nature are but the mathematical thoughts of God."