For all bodies are in perpetual flux like rivers, and parts are passing in and out of them continually. - Gottfried Wilhelm Leibniz

Now, since in the divine ideas there is an infinity of possible universes of which only one can exist, the choice made by God must have a sufficient reason which determines him to the one rather than to another. This reason can be found only in fitness, that is, in the degree of perfection contained in these worlds. For each possible has a right to claim existence in proportion to the perfection it involves. Thus nothing is entirely arbitrary.

[Was gibt es besseres für uns, als] wenn wir uns pflichtgemäß an den Urheber des Alls anschließen, an ihn, nicht nur als den Baumeister der Welt und Urgrund unseres Daseins, sondern als unsern Herrn und Endzweck, der das Ziel unseres Wollens bleiben soll und der einzige Urheber unsrer Glückseligkeit. [Absatz 90]

Even in the games of children there are things to interest the greatest mathematician.