More on usage

I have seen this misused recently so I looked it up to confirm I understood the difference:

Assure – ensure – insure:

A person assures (makes promises to, convinces) other people. Assure takes a personal object. E.g., Our hosts assured us that we would have comfortable rooms.

A person ensures (makes certain) that things occur or that events take place. E.g., Our hosts ensured that we had comfortable rooms.

Insure should be restricted to financial contexts involving indemnification; it should refer to what insurance companies do. E.g., to insure against loss.

From Bryan A. Garner, Garner’s Modern American Usage, Oxford University Press (2d ed. 2003).