Periodicity Quotes

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

Childhood is a complex dialectical process characterized by periodicity, unevenness in the development of different functions, metamorphosis or qualitative transformation of one form into another, intertwining of external and internal factors, and adaptive processes which overcome impediments that the child encounters.

Things work in cycles.

History goes in cycles.

After a Christmas comes a Lent.

When I speak of 'cycles,' I am referring to lengthy intervals of relative homogeneity, if not in the resolving of problems, than at least with respect to the consistency of their capacity to productively irritate.

If the periodicity of the past prevails, a major sustained creedal passion period will occur in the second and third decades of the twenty-first century.

Everything goes in waves. Evolution goes in waves. The ocean goes in waves. Energy goes in waves. Sound travels in waves.