Originally Posted by Wondergirl
principal = head of a school or leader of some sort
The Buddhist principles include chastity, calmness, quiet, and extinguishment of desire and passiond/egotistical want.
The Noble Eightfold Path is the way to the cessation of suffering, the fourth part of the Four Noble Truths. This is divided into three sections: Sila (which concerns wholesome physical actions), Samadhi (which concerns the meditative concentration of the mind) and Prajñā (which concerns spiritual insight into the true nature of all things).
Sila is morality, abstaining from unwholesome deeds of body and speech. The first part of sila is Right Speech — speak in a non-hurtful, not exaggerated, truthful way (samyag-vāc, sammā-vācā). Another is Right Livelihood — do no harm in any way to oneself or other creatures, either directly or indirectly (samyag-ājīva, sammā-ājīva).
I'm guessing your teacher isn't really a Buddhist, doesn't understand its teachings, or has his own brand of Buddhism.