Aristotle divides change in two ways, change by contact, and change in-itself; for example, I hold a cup and move or rotate it - this is change by contact; or a rose grows by itself - it has some inner law of change or growth.
A quantum system, to be specific: a single particle in empty space; does it change by contact or by some inner law?
In the classical situation it's simply at rest; but in QM, Schrodingers equation means its wave evolves:
When it is not interacting with an external system that can detect its position, the electron can spread out over 'different positions'; in the jargon of the theory one says that the electron is in a 'quantum superposition' of one or many different positions.
if we give the wave some kind of ontological weight, then it appears it's never at rest - or is this language inappropriate?