Where imprisonment is the only appropriate sentence, a court must impose the minimum effective period to do justice to both the offender and the interests of society. In determining sentence, courts must carefully balance mitigatory factors (such as guilty plea, recovery of property, first offender status, and contrition) against aggravatory factors (such as preplanning, frequency of offences, and danger to society). Overlong incarceration is counterproductive as it destroys and contaminates, ultimately contributing to the criminalization of society. For contrite first offenders, courts should appeal to the good sense of responsibility residual in them and impose the least punishment which will still achieve the objectives of punishment.