Rajnikanth's dialogues from various films provide concise management lessons and mantras. Some of the key lessons summarized from the dialogues include: planning is important and helps achieve objectives efficiently; getting opinions from subordinates makes an organization democratic; rewarding employees through incentives motivates performance; delegation and implementation are both important for companies; clear communication without room for misinterpretation is key; and being proactive by launching new products before competitors is important for industries like telecom and credit cards.