Definitions: (1) self-satisfied; self-possessed; bold; (2) convinced of the certainty or truth of a matter; confident; authoritative; self-assured; (3) relieved that things are okay again; reassured of a positive outcome

Derivation: Latin, “toward security”
     Note: The original Latin indicates there is always a bit of uncertainty in most certainties.
          It is valuable to put a little (but only a little) bit of doubt in your spiritual practice. There is always a lot more to learn, grow into, and become.

Quote: Be assured that if you knew all, you would pardon all. — Thomas à Kempis (1380–1471) The Imitation of Christ {1418}

Observation: The relative integrity of matter is assured by the fact that energy can be absorbed or released only in those exact amounts which have been designated as “quanta.” This provision in the material realms serves to maintain the universe as an ongoing concern.
     Note: the word quantum can be found in the formulation of the first law of thermodynamics in 1841 by Julius Robert von Mayer (1814–1878) German physicist.