Perhaps he had to be close in order to keep a reason for the things he did. To make the things he did be themselves Life. And not merely a delightful excercise of technical skill which man had been able to achieve because he, of all animals, had a fine thumb. Which is nonsense, for whatever you live is Life."
The end of man is knowledge but there's one thing he can't know. He can't know whether knowledge will save him or kill him. He will be killed, all right, but he can't know whether he is killed because of the knowledge which he has got or because of the knowledge which he hasn't got and which if he had it would save him.