The "evidence," of necessity, is indirect: D'Souza doesn't claim to have communicated with anyone who has died, and he doesn't expect to.
这些“证据”，必然都是间接的：D’索萨并没有声称跟已经死去的人有沟通，他也不期望这样做。
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D'Souza takes it as given that we are all consumed with wondering what will happen to us after death, the way all Europeans were in medieval times, and D'Souza himself still is.