Literally, Lazarus was encouraged, strengthened, and taught. Lazarus enjoyed the perfect presence of the Holy Ghost in his death, but he was also comforted in life. And we, in this dispensation of the Holy Spirit, enjoy the continual presence of His Spirit dwelling in us. It was a separation that was established between the righteous dead and the wicked dead. This shows us the matchless grace of God in salvation.
Salvation is both free and forever.
There would be no crossing from one side to the other. He was hidden in the grace of his God. Only a fool would attempt to answer these questions from his own intellect. But the bible does have some answers. These answers will not satisfy the atheist nor the agnostic with their doubts and denials.