Warren Buffett's quote highlights the importance of financial commitments in the realm of business and investments. When a check is written, it signifies a serious decision and a binding agreement, rather than just a casual discussion. This act solidifies intentions, ensuring that conversations are translated into tangible actions that have real consequences.

In Michael Lewis's book, "The Big Short: Inside the Doomsday Machine," this concept is particularly relevant in the context of the financial crisis. The writing of checks and the subsequent commitments represent critical moments where financial decisions have profound impacts, demonstrating the power of money in shaping outcomes in the economic landscape.