"Nobody knows everything that's hidden in the balance sheets of banks. In fact, they are completely impenetrable."

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We rarely use much debt and, when we do, we attempt to structure it on a long-term fixed rate basis. We will reject interesting opportunities rather than over-leverage our balance sheet. This conservatism has penalized our results but it is the only behavior that leaves us comfortable, considering our fiduciary obligations to policyholders, depositors, lenders and the many equity holders who have committed unusually large portions of their net worth to our care.

— Warren Buffett