Concerning the Ten Commandments, which are the Heads of the Law (161-163)

But to the seventh day of the week he has assigned the greatest festivals, those of the longest duration, at the periods of the equinox both vernal and autumnal in each year; appointing two festivals for these two epochs, each lasting seven days; the one which takes place in the spring being for the perfection of what is being sown, and the one which falls in autumn being a feast of thanksgiving for the bringing home of all the fruits which the trees have produced.

And seven days have very appropriately been appointed to the seventh month of each equinox, so that each month might receive an especial honour of one sacred day of festival, for the purpose of refreshing and cheering the mind with its holiday.

There are also other laws brought forward, enacted with great wisdom and excellence, conducing to the production of gentleness and fellowship among men, and inviting them to simplicity and equality; of these some have reference to

for God thought the land, both the champaign and the mountainous country, after it had been labouring for six years in the production of crops, and the yearly yielding of its expected fruits, worthy of some relaxation, for the sake of recovering its breath as it were, and that, becoming free again, if one may say so, it might exert the spontaneous riches of its own nature.