Jesus answered and said to them, “Do not grumble among yourselves. No one can come to Me unless the Father who sent Me draws him; and I will raise him up on the last day" (John 6:43,44).
(Jesus said) "Whoever causes one of these little ones who believe to stumble, it would be better for him if, with a heavy millstone hung around his neck, he had been cast into the sea. If your hand causes you to stumble, cut it off; it is better for you to enter life crippled, than, having your two hands, to go into hell, into the unquenchable fire, where their worm does not die, and the fire is not quenched" (Mark 9:42-44).
(Jesus said) "Do not fear those who kill the body but are unable to kill the soul; but rather fear Him who is able to destroy both soul and body in hell" (Matthew 10:28).
(Tim) We've warned against Rob Bell before here and here. That second link is a post titled, "Just one more savage wolf..." alluding to this warning to the Ephesian elders by the Apostle Paul:
Be on guard for yourselves and for all the flock, among which the Holy Spirit has made you overseers, to shepherd the church of God which He purchased with His own blood. I know that after my departure savage wolves will come in among you, not sparing the flock; and from among your own selves men will arise, speaking perverse things, to draw away the disciples after them. Therefore be on the alert, remembering that night and day for a period of three years I did not cease to admonish each one with tears. (Acts 20:28-31)
If possible, that savage wolf, Rob Bell, becomes bolder in his wickedness. Watch this video: