What is the What by Dave Eggers

"God said, 'You can either have these cattle, as my gift to you, or you can have the What.' My father waited for the appropriate response...'But...' Sadiq said, helping out, 'What is the What?'...And God said to the man, 'I cannot tell you. Still, you have to choose. You have to choose between the cattle and the What.'...God was testing the man, to see if he could appreciate what he had been given, if he could take pleasure in the bounty before him, rather than trade it for the unknown. And because the first man was able to see this, God has allowed us to prosper."