Martyn Lloyd-Jones
Evangelism must start with the holiness of God, the sinfulness of man, the demands of the Law and the eternal consequences of evil.

Whenever you hear a word from my mouth, you shall give them warning from me. If I say to the wicked, ‘You shall surely die,’ and you give him no warning, nor speak to warn the wicked from his wicked way, in order to save his life, that wicked person shall die for his iniquity, but his blood I will require at your hand.
Ezekiel 3:17b-18