I have been shown that evil angels in the form of believers will work in our ranks to bring in a strong spirit of unbelief. Let not even this discourage you, but bring a true heart to the help of the Lord against the powers of satanic agencies. 3SM 410.2
These powers of evil will assemble in our meetings, not to receive a blessing, but to counterwork the influences of the Spirit of God. Take up no remark that they may make, but repeat the rich promises of God, which are yea and amen in Christ Jesus. 3SM 410.3
We are never to catch up the words that human lips may speak to confirm the evil angels in their work, but we should repeat the words of Christ. Christ was the Instructor in the assemblies of these angels before they fell from their high estate.—Letter 46, 1909. 3SM 410.4
We have great and solemn truths to give to the world, and they are to be proclaimed in no hesitating, limping style. The trumpet is to give a certain sound. Some will come to hear the strange message out of curiosity; others with a longing to receive true knowledge, asking the question, “What shall I do that I may inherit eternal life?” (Mark 10:17). 3SM 410.5
Thus men came to Christ. And mingling with His hearers were [evil] angels in the form of men, making their suggestions, criticizing, misapplying, and misinterpreting the Saviour's words.... 3SM 410.6
In this time evil angels in the form of men will talk with those who know the truth. They will misinterpret and misconstrue the statements of the messengers of God.... 3SM 411.1
Have Seventh-day Adventists forgotten the warning given in the sixth chapter of Ephesians? We are engaged in a warfare against the hosts of darkness. Unless we follow our Leader closely, Satan will obtain the victory over us.—Letter 140, 1903. 3SM 411.2