The enemy's purpose goes against God's purpose. The enemy works to steal glory from God. Mostly to have it for himself. But if he cannot have it, then it is the next best thing that God cannot have it.
The enemy works to make people miserable. Misery drive people away form God. It encourages them to focus on the negative. It drives them to seek relief regardless of cost.
The enemy propagates lies. The lies confuse a true understanding of God. They create a reluctance to unite with God and his family.
So, God's purpose is against the enemy's He promotes his own glory. It is truth -- he is the only one deserving glory. God and glory orient creation in the correct direction.
God blesses people. Blessing draws people to him. They will focus on the positive. They will endure and persevere when difficulty does come.
God proclaims truth. Truth conveys a correct understanding of God, the world and how things should function. Truth reveals why it is good and right to unite with God and his people.