Ephesians 6:11

Put on the whole armour of God
Not that which God himself is sometimes clothed with, and uses against his enemies; but what he has provided for his people, and furnishes them with; the particulars of which are after mentioned: and it is called "the armour of God", because it is prepared by him for his people, and is bestowed on them by him; and because it is in its own nature divine and spiritual, and not carnal; and because it is provided for fighting the Lord's battles, and is used in them; and because the efficacy of it is from him, and the execution it does is owing to him: and it is whole, complete, and perfect; and all of it is useful, and no part to be neglected, but all to be taken and "put on"; which is not to make and provide this armour, but to take it, as in ( Ephesians 6:13 ) ; as being ready made and provided, and to expect and prepare for battle, and make use of it; and this supposes saints to be in a warfare state, and that they are in the character of soldiers, and have enemies to fight with, and therefore should be accoutred with proper and suitable armour, to meet them:

that ye may be able to stand against the wiles of the devil;
who is the grand enemy of Christ and his people, and a very powerful and cunning one he is; so that the whole armour of God should be put on, which is proof against all his might and craft, in order to stand against him, oppose him, and fight, and get the victory over him, which in the issue is always obtained by believers; for they not only stand their ground in the strength of Christ, and by the use of their armour confound his schemes, and baffle all his arts and stratagems, but are more than conquerors through him that has loved them.