what lessons can one learn from the novel, "The Arms And The Man"

"Arms and the Man"is a delightful
comedy,According to the "Commentary", its purpose is to make us think,by
illustrating       how people can ruin their lives through false ideals. thus Raina     
act rationally by lying to save Bluntscli,although the telling of the  lies is frowned
upon by society.Louka acts rationally in trying to better hereself by winning and then
marring Raina's fiance.Major Petkoff acts rationall inasking whether Bluntscli can
support Raina   in the manner to which she is accustomed. Sergius,however, act
irrationally in expecting Raina not tolook at another man, in des- pising him self for
being attracted to other women, and in marr-   ing Louka because of a pledge he made to
her during a moment    of excitement. Sergius also acts irrationally in bravely leading
his cavarly against the Serbian machine-guns; it was only luck that prevented the
massacre of his regiment by modern weapen.The behaviour of Captain Bluntschli and the
play's conclusion insin-   uate the need for common-sense realism inour
expectations        and behaviour.(79)