(720 ILCS 5/1-2) (from Ch. 38, par. 1-2)
    Sec. 1-2. General purposes. The provisions of this Code shall be construed in accordance with the general purposes hereof, to:
    (a) Forbid and prevent the commission of offenses;
    (b) Define adequately the act and mental state which constitute each offense, and limit the condemnation of conduct as criminal when it is without fault;
    (c) Prescribe penalties which are proportionate to the seriousness of offenses and which permit recognition of differences in rehabilitation possibilities among individual offenders;
    (d) Prevent arbitrary or oppressive treatment of persons accused or convicted of offenses.
(Source: Laws 1961, p. 1983.)