Pray that the saints would see that the gospel service is a warfare and would learn to pray to bind the strong man, Satan, in order to plunder the sinners kept by him so that they may be brought into the house of God through regeneration for the kingdom of God (Mark 3:27; 2 Cor. 4:3-4).
Mark 3:27—But no one can enter into the house of the strong man and thoroughly plunder his goods unless he first binds the strong man, and then he will thoroughly plunder his house.
2 Cor. 4:3-4—And even if our gospel is veiled, it is veiled in those who are perishing, in whom the god of this age has blinded the thoughts of the unbelievers that the illumination of the gospel of the glory of Christ, who is the image of God, might not shine on them.
For further reading please refer to the Life-study of Mark, pp. 111, 113.