De Plantatione

for this has a principle in it very consistent with nature and with good morals. At all events it so happens that the roots of the universe, the elements of which the world is composed, are four—earth, water, air, and fire. Also, that the seasons of the year are equal in number, namely, winter and summer, and those others which are between these two, spring and autumn.

And as this is the most ancient of all square numbers, it is found to exist in right angles, as the figure of a square in geometry shows. And right angles are manifest examples of correctness of reason. And right reason is an everlasting fountain of virtues.