for of all the outward blessings that God affords us, our time is incomparably the most precious and inestimable; and therefore, though he gives us his other blessings in great variety, and provides for us a plentiful choice of meats, drinks, and raiment, yet in the distribution of our time he seems to be more sparing and straithanded ; for he gives it not to us in rivers, but drop by drop, and minute after minute, so that we can never enjoy two moments together, but, whenever he gives us one, he always takes away another.

In the conflict theory, there is an impulse or a motive, and an opposing counterimpulse or countermotive.

Insecurity of employment, which is a prerequisite of work discipline, contradicts capital's requirement for unlimited quantities of potentially wageable labour.

Recent research has shown that sleep allows for the clearing of toxic substances from the brain. It does this through the glymphatic system, which is the brain's equivalent of the lymphatic system.