Imam Ghazali, like other Muslim philosophers, accepted the Greek idea of the soul having three faculties and to each faculty he assigned a virtue. So the rational faculty develops wisdom, the aggressive (or irascible) faculty develops courage, whilst the lustful (or passionate) faculty develops temperance. When there is harmony between the three, they lead to the development of the virtue of justice. Ghazali uses the following verse of the Qur’an to support this idea: The believers are those who believe in God and his Messenger, then have not doubted, and have struggled with their possessions
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