PUTTING ON THE WHOLE ARMOUR OF GOD

The Armour of God

Armour or armor is protective covering used to prevent damage from being inflicted to an object, individual or a vehicle through use of direct contact weapons or projectiles, usually during combat, or from damage caused by a potentially dangerous environment or action- Wikipedia

Ephesians 6:10-17

¹⁰ Finally, be strong in the Lord and in his mighty power. ¹¹ Put on the full armor of God, so that you can take your stand against the devil’s schemes. ¹² For our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms. ¹³ Therefore put on the full armor of God, so that when the day of evil comes, you may be able to stand your ground, and after you have done everything, to stand. ¹⁴ Stand firm then, with the belt of truth buckled around your waist, with the breastplate of righteousness in place, ¹⁵ and with your feet fitted with the readiness that comes from the gospel of peace. ¹⁶ In addition to all this, take up the shield of faith, with which you can extinguish all the flaming arrows of the evil one. ¹⁷ Take the helmet of salvation and the sword of the Spirit, which is the word of God.

The putting on the whole armour will protect the Christian.

breastplate of righteousness
Seek ye first the kingdom of God and its righteousness and all other things shall be added unto you.

belt of truth

The devil is a liar and the father of all liars. We must endeavour to tell the truth no matter what.

shield of faith

Faith protects us from the devil. The devil is afraid of you if you have faith because with faith all things are possible for you. Jesus said if have a little faith like the mustard seed, you can say to the mountain to be moved and it will. 

The devil's tactic is to make you doubt God's word just as he did to Eve in the Garden of Eden. Mind you that doubting His word is contrary to His will. 

And without faith it is impossible to please God, because anyone who comes to him must believe that he exists and that he rewards those who earnestly seek him. (Heb. 11:6)

sword of the Spirit, which is the word of God

The word of God is sharper than any two-edged sword. Notice the devil was defeated by Jesus with the Word of God. He always quoted 'it is written...'
 In the beginning was the Word, and the Word was with God, and the Word was God.(John 1:1)
This is the reason why you will always defeat the devil when you apply the Word.