What are the four forms of superstition that Davies defines?in reference to A Few Kind Words for Superstition"

Robertson Davies in his essay "A Few Kind Words for
Superstition" identifies four forms of superstition. These are: (1) Vain Observances,
(2)  Divination, or consulting oracles, (3) Idolatry, and (4) Improper Worship of the
True God.

Vain Observances involves doing or not doing
certain because of superstitious beliefs. Like Some people may prefer to stay indoors
rather than venture out of their homes if the date 13 falls on a Friday. Divination or
consulting divination is the kind of superstition involves belief in some divine power
of a person to guide them.  Idolatry, is belief in power of not a person but a thing to
help or protect you. It might involve wearing your lucky shirt when going for an
important meeting, wearing a ring with a particular type of gem, or wearing a charm. 
Improper worship involves indulging in rituals rather than having true faith in power
and goodness of God.

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