It's always necessary to know when a stage of one's life has ended. If you stubbornly cling to it after the need has passed, you lose the joy and meaning of the rest. And you risk being shaken to your senses by God.
At Berkshire, I both initiate and monitor every derivatives contract on our books ... If Berkshire ever gets in trouble, it will be my fault. It will not be because of the misjudgments made by a risk committee or chief risk officer.