A temptation is a trial.  By itself this is neither good nor bad.  A scientist puts his research subjects to the test.  A judge tries a case in his courtroom.  On the face of it, a temptation could be morally neutral.  This is not so, however when it is pursued for an evil end.  And the evil one always has the evil end in mind in tempting us.

Evil-ended trials are of two sorts: absolute and relative.  The temptation to adultery is absolutely evil.  The temptation to watch late-night TV is relative.  Both trials are to be well understood and carefully policed.  Absolutely evil temptations are never to be given any quarter under any circumstances.  Relatively evil temptations are to be despised as always potentially dangerous and only to be tolerated with the careful deliberations akin to the application of just-war theory, the principle of double effect, and the use of lethal force.  More on these another time.