Psychology has a long past, yet only a short history.

All sorts of things occur in our consciousness which would mean nothing without survivals of previous experiences.

With any considerable number of repetitions, a suitable distribution of them over a space of time is decidedly more advantageous than the massing of them at a single time.

The feeling of gratitude arises from the full satisfaction of a good experience. Gratitude mitigates the feeling of envy because when we are grateful, we understand the value of what we possess rather than focusing on what others have.

-- Melanie Klein