It is not going to happen from lectures, regardless of their profundity. In order to stimulate introspection, one must be availed a symbolic ritual - subtle, but thought provoking, which will bring out his best. Humility is one of the most fundamental positive character traits. It cannot be instructed. It must emerge from within, often after an external non-verbal catalyst.
Life is full of opportunities for realizing our insignificance.
Regrettably, this is one of the most difficult lessons to accept. Rashi explains why the korban, sacrifice, brought by the metzora as part of his penance consists of birds. His affliction came as punishment for the chatter of gossip and slander. This would be understandable if both birds were slaughtered. A man does not receive punishment only for the evil speech that he has spoken.