5 The matter may, as Hasluck J has done, be put in a statutory context by referring to the Sentencing Act 1995, s 6, which endeavours to state in statutory form the principles of sentencing. The important principle, of course, is that each sentence imposed must be commensurate with the seriousness of the offence or, in other words, the criminality involved in its commission. But that criminality includes questions concerning the culpability of the offender, because s 6(2) directs the sentencing court, not only to the statutory penalty for the offence and the circumstances of its commission, including the vulnerability of any victim, but to both aggravating factors set out in s 7 and mitigating factors, to which the Act refers in s 8. These factors may relate to the circumstances of the commission of the offence or be personal to the offender. The application of that process will then produce a sentence for each individual offence designed to be properly proportionate to the criminality involved.