Shri Krishna now talks about the great souls in these verses. Material life is a prolonged dream, which is being experienced by the souls who are sleeping under the sway of material energy. In contrast, the great souls are those who have woken up from their ignorance and brushed aside material consciousness like a bad dream. Released from the grips of the material energy, Maya, are now under the shelter of the divine Yogmaya energy. Such enlightened souls have woken up to the spiritual reality of their eternal relationship with God. 

In the process of kīrtan, hearing and chanting are helpers. The essence is to remember God. If we leave it out, the kīrtan will not purify the mind. Thus, Shri Krishna says here that His devotees do kīrtan, while constantly engaging the mind in thinking of Him. They practice this with great determination for the purification of the mind. 
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