Quotes About Periodicity

The elements, if arranged according to their atomic weights, exhibit an apparent periodicity of properties.

Four types of holidays may be distinguished: fixed (stativae), movable (conceptivae), for special circumstances (imperativae) as well as market days (nundinae), which occurred every ninth day to mark a kind of week, their periodicity being thus fixed

I don't write as much now as I used to, but I write. The lines still come, maybe periodically, and I'll go through these little bursts of time where I write a lot of things then a long period of time where maybe I don't write anything.