About I. Electrons are ultrafast moving particles

Electrons move at incredible speeds. For example, in metals (like sodium metal), electrons are continuously moving. Yet in spite of the electrons' incessant motion, the atoms stay connected and the material is solid. Even liquids have relatively solid bonds holding the molecules together. This hides the fact that in liquids - for example, liquid water - the bonds between the molecules are breaking and reforming every few femtoseconds.

What allows this dichotomy of continuous movement of electrons yet stable bonding between atoms?