Thou believest that there is one God; thou doest well: the devils also believe, and tremble. James 2:19
Therefore rejoice, [ye] heavens, and ye that dwell in them. Woe to the inhabiters of the earth and of the sea! for the devil is come down unto you, having great wrath, because he knoweth that he hath but a short time. Rev 12:12
And when the thousand years are expired, Satan shall be loosed out of his prison, And shall go out to deceive the nations which are in the four quarters of the earth, Gog and Magog, to gather them together to battle: the number of whom [is] as the sand of the sea. And they went up on the breadth of the earth, and compassed the camp of the saints about, and the beloved city: and fire came down from God out of heaven, and devoured them. And the devil that deceived them was cast into the lake of fire and brimstone, where the beast and the false prophet [are], and shall be tormented day and night for ever and ever. Rev 20:7-10
Blessed [is] the man that endureth temptation: for when he is tried, he shall receive the crown of life, which the Lord hath promised to them that love him. Let no man say when he is tempted, I am tempted of God: for God cannot be tempted with evil, neither tempteth he any man: But every man is tempted, when he is drawn away of his own lust, and enticed. Then when lust hath conceived, it bringeth forth sin: and sin, when it is finished, bringeth forth death. Do not err, my beloved brethren. James 1:12-16
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Those who are believers will recoil, repent, be ashamed, regret, change ways, ask God for forgiveness, only to fail again and again, and to recoil ever so stronger again and again! It's an ongoing tug of war, a process.
We erupt when someone cuts us off on the way to work, we give in to gluttony, we engage in small talk, draw attention to ourselves, look lustfully at someone's spouse, etc, even though we don't mean to.
Even during the Divine Liturgy all sorts of thoughts well up in our minds and the Fathers spoke about them and we believe those are little demons testing us, so we concentrate on Christ and they disappear as quickly as they came in.
Evil is very much present and active in the world, and ever so drawn to where righteousness abides.