You stand before God with sweaty palms and a racing heart. He's asking you only one question: Do you know and have you accepted My Son?
You reply confidently: Yes.
Finally, He has granted you entry into heaven.
As you are about to enter the golden gates, your friend at school -- whom you've known for quite sometime -- quickly yells something at you. You know that person isn't a Christian and a deep sorrow sweeps over you as you remember how you tried to just get enough courage to speak to him/her about Christ.
But, now it is too late. You look into the eyes of this friend you've known and can't help to feel some pity for them. You know what's going to happen. You try to ignore the feeling of guilt and sadness. Besides, you're going to heaven -- why dwell the past? You strain your ears to hear what he/she is trying to say. Finally, you understand. Your friend is asking you one simple question:
"Why didn't you tell me?"
Isaiah 43:8 -- Lead out those who have eyes but are blind, who have ears but are deaf.