1 Corinthians 15:14,17
And if Christ has not been raised, then our preaching is in vain and your faith is in vain. And if Christ has not been raised, your faith is futile and you are still in your sins.

We must stand firm in the truth, in the message, for without it we have no power. We may be very nice and kind to one another, but that will not convince the world of sin, and bring them to Jesus. The truth alone can do that.
Martyn Lloyd-Jones