Be not deceived (mh planasqe). Do not be led astray (planaw) by such a false philosophy of life. Evil company (omiliai kakai). Evil companionships. Old word, omilia, from omilo (a crowd, gang, bunch). Only here in N.T. Good manners (hqh). Old word (kin to eqo) custom, usage, morals. Good morals here. This line of poetry (iambic) occurs in Menander. It may be a current proverb. Paul could have gotten it from either source.