Again, I look at extreme cases to make me see things clearly. Suppose God has made salvation extremely difficult for us. Say we must go through many loops and meet all kinds of stringent requirements. Then even if we don't make it, the consequence understandably probably wouldn't be so bad. Now that the Lord has made salvation so simple and direct for us: basically, all we need to do is believe, I intuitively see that the consequence of not appreciating his great offer would be a lot more severe too.