Storgé, tharsos, timé.

Maslow’s Hierarchy of Needs–a theory of human developmental psychology by Abraham Maslow in 1943. He believed that these needs triggered behavior; in other words, this pyramid is the source of our motivation–what makes us live. You may be familiar with it if you’ve taken an introductory psychology course. I have to post this since I can never seem to keep it in my head for some reason (and it’s so simple!).

This theory is also very important in nursing since we have to assess the patient’s basic needs from the “bottom-up”. The highest priority needs of the patient are at the bottom of the pyramid, while the lower priority needs are at the top.

Sources:
http://psychology.about.com/od/theoriesofpersonality/a/hierarchyneeds.htm