That, if a straight line falling on two straight lines make the interior angles on the same side less than two right angles, the two straight lines, if produced indefinitely, meet on that side on which are the angles less than the two right angles.

I don't pray to God for forgiveness or favors, I only pray to be closer to Him, and when I pray, I fill my heart with love. When I pray this way, I know that God is love. When I feel that love, I remember that we don't need angles or a heaven, because we are a part of God already.

The property of similar triangles, and that contained in Prop. 47, Book I [the ], are most important theorems in Geometry.