In this essay two issues are critically addressed, namely, the foundation of Avicenna's ethical determinism and its implication for a theory of justice. As to the first issue, it regards the analysis of Avicenna's deterministic theory notwithstanding his rare but ambiguous use of the free will, suggesting terms such as "will", "voluntary" and "choice". In such a theory, where everything is governed by the laws of pre-established harmony, the ethical evil done by man is viewed in the same way physical evil is, as contingent, minimal, determined by God, and having its proper function within world order and harmony. As to Avicenna's justification of punishment, one must recognize that Avicenna did not address the issue in its socio-jurid...