Put on the full armor of God and keep praying for all God's people

Ephesians 6:10-24
Finally, be strong in the Lord and in his mighty power.  Put on the full armor of God, so that you can take your stand against the devil’s schemes.
Stand firm then, with the belt of truth buckled around your waist, with the breastplate of righteousness in place,  and with your feet fitted with the readiness that comes from the gospel of peace.  In addition to all this, take up the shield of faith, with which you can extinguish all the flaming arrows of the evil one.  Take the helmet of salvation and the sword of the Spirit, which is the word of God.
And pray in the Spirit on all occasions with all kinds of prayers and requests. With this in mind, be alert and always keep on praying for all the Lord’s people.
Final Greetings: Peace , love with faith from God, Grace to all who love our Lord Jesus Christ with an undying(不朽) love.
Paul does not pretend it will be easy to maintain thes standards. There is a need for 'body building'. The fight is on. We are up against powerful forces in a spiritual struggle. We need spiritual weapons - and these God provides. 
Like the Roman sholdier, we have a belt and breastplate, shoes and shield, helmet and sword. God fits us out with all the armour we need for defence and protection. With these we can make our stand against all-comers.
Most important of all, is the unseen weapon of prayer. The prayers of his readrs can help Paul keep up his courage and speak up for God in that faraway prison. So the letter closes on a personal note. Tychicus, paul's 'postman' here, also carried the letters to the Colossians and Philemon. 
Paul's closing ptayer for his brothers and sisters in Christ matches and expands on his opening greeting: may  God grant peace, love and faith to all - and his grace be with them.
Why?
We need spiritual weapons to against spiritual fighting. 
Most important weapon is the unseen weapon of prayer. Pray to God's people and missioners.
Peach, faith, love and grace are come from the Lord. It is nice greeting to brothers and sisters.
How?
Keep praying in spirit for all the Lord's people. Do not need pray for myself for grace frm the Lord is fulfillment to me.