A classic quote - One has to give Theosophy credit for making occultism a topic of popular interest - I think the term has garnered a lot of misconceptions since then, so let the following be considered to show that true occultism is based on principles of strong ethics, clean living, stable character, and clear thinking. \
What is occultism ?
Occultism is the not telling all that one knows;
Occultism is the not saying all one suspects;
Occultism is the not speaking of all one "sees";
but reverting inward to the source of sight.
Occultism the not repeating of all one "hears";
but a closed mouth lest hearing should escape therethrough.
Occultism is the not speaking of faults of others;
Occultism is the not setting of fixed plans;
but a fluidic position balanced in the good law.
Occultism is the not laying down for another his duty;
but self-watchfulness in performing one's own.
Occultism is the not doing what one wishes and
when one wants;
Occultism is the not listening to gossip or slander;
but good will to all, from which gossip and slander
can draw no sustenance.
Occultism is the not giving way to anger or impatience;
Occultism is the not being vain of one's learning, or proud;
Occultism is the not hurrying one's daily affairs nor forcing one's progress;
but knowing the amplitude of time in all things.
Occultism is the not doing all the great work there is to do;
but the will to labor; the willingness to accept help or be a helper;
the joy that another does a task the best.
Occultism is the not striving to be a leader of men;
but to follow a line.
Judge Echoes of the Orient III, (260-61) (taken from Theosophy VIII, October 1920, pp. 353-54)
There's a pretty decent article on the subject: