Fr. Z: Talk like a Desert Father.

You are fair and comely, O daughter of Jerusalem:

terrible as an army set in array. - Little Office

Fr. Z has an excellent piece on the Devil - seriously.

Angels, the holy angels and the fallen, have missed nothing of your life since the instant of your conception. And they never forget anything.

Fallen angels, the enemy, the Devil, can’t literally get into our heads or thoughts or touch our will, but they don’t have to in order to know us really well.

And they hate you. They hate you. They hate you.

With relentless malice the “prince of this world” will work to trick you into letting him have some control in your life. Demons will cleverly and with perfect timing stimulate appetites and passions based on how well they know your proclivities. They strive to twist your heart and mind away from God in order to diminish even by a little the love everyone will share in heaven as they shine in the magnified glory of the Trinity.

The Devil and other demons are always held in check by God. They cannot simply have their way with us or the material cosmos around us unless God permits it according to His plan. But they are devious and tireless. - Read the entire post here.
 

As a remedy and protection, Fr. Z encourages the Sacrament of Penance - regular confession, as well as devotion to Our Lady and St. Joseph, the angels - especially St. Michael.

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In addition to the sacraments, as Father mentioned,  devotion to Christ in the Blessed Sacrament accompanied by devotion to Our Lady and her Rosary, seems to me to be an assured source of consolation, courage, and hope of perseverance.

“Mary, until the end of time, will always uncover the evil of the infernal serpent and of his infernal plots; she will make his diabolical counsels vanish and will free his loyal servants from his cruel clutches. The power of Mary over all the demons will shine particularly in the end times, when Satan will strike at her heel, that is to say, on the humble slaves and poor children of Mary, who are called to battle against the gates of hell”. (De Montfort, True Devotion, no.54) 
 

Who is she that comes forth as the morning rising, fair as the moon, bright as the sun, terrible as an army set in array?

Rejoice, O Virgin Mary, you alone have destroyed all heresies in the whole world. - Little Office