He could have focused on the real world, prioritizing extending his life after every trip to the future, and immediately terminated himself after carrying the knowledge back. In this way, he could have enjoyed a life of several centuries in the twenty-first century, living a life of comfort beyond what most people could imagine.
However, he wanted to change the destiny of the entire humanity, which meant that he had to store large amounts of information in his brain, indirectly giving up the possibility of resurrection.
If it were the him from before, he might have regretted his actions.
But now, he felt fine with his choice, even if given another chance, he would still go ahead without hesitation.
Being just a mere transporter, he would only experience material satisfaction and mental emptiness.
Now, he felt that everything was just right.
As for enlightenment, he had already had enough of it.
"Do you understand now?"