There's a difference between knowing God and knowing about God. When you truly know God, you have energy to serve Him, boldness to share Him, and contentment in Him.
J. I. PackerChrist had no interest in gathering vast crowds of professed adherents who would melt away as soon as they found out what following Him actually demanded of them. In our own presentation of Christ's gospel, therefore, we need to lay a similar stress on the cost of following Christ and make sinners face it soberly before we urge them to respond to the message of free forgiveness. In common honesty, we must not conceal the fact that free forgiveness in one sense will cost everything.
J. I. PackerThere are two sorts of sick consciences, those that are not aware enough of sin and those that are not aware enough of pardon.
J. I. Packer