Below is a list of Dr. Martyn Lloyd-Jones’ criteria for effective evangelism as summarized by Iain Murray.
The five principles are, as follows:
1. The supreme object of this work is to glorify God. The first object of preaching the gospel is not to save souls. Nothing else, however good in itself, or however noble, must be allowed to usurp that first place.
2. The only power that can really do this work is that of the Holy Spirit …
3. The one and only medium through which the Holy Spirit works is the Word of God … The medium which is used by the Holy Spirit is the truth.
4. The true urge to evangelization must come from apprehending these principles and, therefore, of a zeal for the honour and glory of God, and a love for the souls of men.
5. There is a constant danger of error, and of heresy, even amongst the most sincere, and also the danger of a false zeal and the employment of unscriptural methods
How To Bring Men To Christ-R.A. Torrey