What a wonderful way to explain it...

A sick man turned to his doctor, as he was preparing to leave
the examination room and said, "Doctor, I am afraid to die. Tell me
what lies on the other side."

Very quietly, the doctor said, "I don't know."

"You don't know? You, a Christian man, do not know what is on
the other side?"

The doctor was holding the handle of the door; on the other side
of which came a sound of scratching and whining, and as he opened
the door, a dog sprang into the room and leaped on him with an eager show
of gladness.

Turning to the patient, the doctor said, "Did you notice my dog?
He's never been in this room before. He didn't know what was inside.
He knew nothing except that his master was here, and when the door
opened, he sprang in without fear. I know little of what is on the other
side of death, but I do know one thing...I know my Master is there and
that is enough."