Martyn Lloyd-Jones
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.

The flesh and blood of Christ are not less truly given to the unworthy than to the elect believers of God; and yet it is true, that just as the rain falling on the hard rock runs away because it cannot penetrate, so the wicked by their hardness repel the grace of God, and prevent it from reaching them.
John Calvin