Matthew 10:27

Do not be afraid of those who kill the body but cannot kill the soul; but rather be afraid of Him who can destroy both soul and body in hell.

If we don’t understand heaven and hell, we have no fear of the consequences of sin on the earth because this life is all there is.  What we believe affects our viewpoint on eternity and what we value while here on earth, whether pleasing God or man.  Hell is not a place anyone who has understanding wants to go.