Jehovah’s servants are commanded to be “fitly united in the same mind and in the same line of thought.” (1Co 1:10; Php 2:2; 1Pe 3:8) This means, of course, being united where the interests of pure worship are involved​—the important things—​not in individual tastes or in minor matters that will be resolved as maturity is reached. (Ro 14:2-6, 17) They are to be “of the same mind in the Lord” (Php 4:2), not to be quarreling, but to “think in agreement.”​—2Co 13:11.

“The god of this system of things,” the Devil, is responsible for blinding the minds of unbelievers to the illumination of the good news about the Christ. (2Co 4:4) The danger exists, therefore, that this archenemy of God may seduce Christians by his cunning, to corrupt their minds away “from the sincerity and the chastity that are due the Christ.” (2Co 11:3) Accordingly, it is necessary that Christians exhibit unity of mind and reasonableness, continuing in prayer, in order that the peace of God “that excels all thought” may guard their mental powers by means of Christ Jesus.​—Php 4:2, 5-7.