It was on my early days of migration to the holy city of Qum and I had to complete the preliminaries befor applying for a course on (the subject of) rational concepts.
Meantime, there was a lecture session on Islamic ethics that was taught every Thursday and Friday by my favorite personality His Holiness Imam Khomeini.
It was in fact a lesson on Islamic teachings and spiritual experience rather than Islamic ethics in the dry academic sense of the term, which had intoxicated me.
Without any exaggeration and hyperbole, this subject would stimulate me so much that until the following Monday or Tuesday, its strong influence on me would linger on.
A significant part of my intellectual and spiritual character was formed by that subject (Islamic teachings) and thereafter by other ones that in the course of twelve years I learnt from that Divine guide (the Imam).
Thus, I always consider and know myself to be indebted to him, for truly he was “the holy Divine spirit.”
Taken from: Reasons for Inclination towards Materiality, by Professor Martyr Mortaza Motahhari, page 10.