Now the purpose of the commandment is love from a pure heart, from a good conscience, and from sincere faith, from which some, having strayed, have turned aside to idle talk, desiring to be teachers of the law, understanding neither what they say nor the things which they affirm.—1 Timothy 1:5-7
Another thing that greatly hinders God's people is a hardness of heart caused by hearing men without the Spirit constantly preaching about the Spirit. There is no doctrine so chilling as the doctrine of the Spirit when held in cold passivity and personal unbelief. The hearers will turn away in dull apathy from an exhortation to be filled with the Spirit unless the Spirit Himself is giving the exhortation through the speaker. It is possible to learn this truth and preach it faithfully, and still be totally devoid of power. The hearers sense the lack and go away with numbed hearts. Theirs is not opposition to the truth, but an unconscious reaction from unreality. Yet scarcely one of the hearers can tell another what the trouble is; it is as if they had been hearing an echo and not the voice, or seeing a reflection and not the light itself. Paths to Power, 55.
"Lord, that's a challenging thought. I'm sure that I have many times preached and taught in my own strength, without the filling and the power of the Holy Spirit. Deliver me from that error, Lord, that no one's heart may be hardened through my failure. Amen."