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.

It follows, therefore, of necessity that the sides of a square must be all equal to one another. And equality is the parent of justice, which is the mistress and ruler of all the virtues, so that it is now proved that this number four is the symbol of equality, and justice, and of all virtue, beyond any other number.

And the number four is likewise called "all," because it comprehends in its power the numbers up to ten, and the number ten itself. That is comprehends all the numbers up to itself is manifest to every one; but that it also comprehends [*](Leviticus xix. 25. )

when we have put them together, one, two, three, four, we shall find what we were doubting about; for of one and four, the number five will be found to be composed, and of two and four six are made up; the number seven, again, consists of three and four; again, according to a triple combination of one, and three, and four, the number eight is composed; also of two, and three, and four, the number nine; and the number ten is made of all the numbers together, for one, and two, and three, and four make ten.

On this account also, Moses said that in the fourth year all the fruit of the tree shall be holy; for this number has an even, and an entire, and a full, and (as one may almost say) every possible reason in it, because the number ten, of which four is the parent, is the first starting place of all the numbers when put together after the unit; and the number four and the number ten are both also called "all," but the number ten is so called by reason of its operation, this number four with reference to its potentiality.

And Moses very appropriately says that the fruit of education is not only holy but also praised; for every one of the virtues is a holy thing, but most especially is gratitude holy; but it is impossible to show gratitude to God in a genuine manner, by those means which people in general think the only ones, namely offerings and sacrifices; for the whole world could not be a temple worthy to be raised to his honour, except by means of praises and hymns, and those too must be such as are sung, not by loud voices, but by the invisible and pure mind, which shall raise the shout and song to him.